Your going to have to do some fudging.
Rogues get a big level 17 feature as part of their sub-class (2 turns, double damage).
Fighter's get a big level 17 feature as their core class (2 action surges).
Agreed, and noted when someone suggested the barbarian monk. I think in some cases we can come up with appropriate conversions (ki for instance has some amount of compatibility with spell slots, assuming that the elemental monk's abilities are at all sensibly priced)You're going to run into a lot of oddities, because a lot of subclasses NEED their base class.
Interestingly enough, if you look at circle of the land, warlock patrons (which is their archetype - pact is just a variation of the base class) and sorceror paths, they all seem to line up ok. It seems that their additional spells known are being treated as a feature and they are losing some class features to get them.Oaths, Pacts, Domains, and Circle of Land all grant additional spells known, which can play havoc on spell lists and really allow for casters to have giant doses of flexibility that was never accounted for. Or are useless to classes with no spellcasting.
Yeah, covered. Ideally we should be able to find some sort of spell slot correlation for 'is raging'. I really like the idea of a druid spending spell slots or wildshapes to fuel totem warrior abilities. Take a look below for the equivalencies.Frenzied Berserkers and Totem Warriors need Rage to activate their powers.
Problematic, although they are trading off a limited base resource for an improved ability: one could argue that simply being unable to use the ability is not a great loss, as your class will have some alternative base resource instead that isn't depleted by your archetype. Loss of flexibility, but not a big hit to raw power. Take a look below for the equivalencies.Valor and Lore Colleges grant bonuses to Bardic Inspiration dice.
Unlike bardic inspiration, base channel divinity usage is extremely limited. In this case moving a charge of channel divinity into the archetype instead of the base class seems like the right move.Both Domains and Oaths need Channel Divinity to use their powers.
True - I think this one relies on modifying a very specific class ability almost exclusively, so it's not really going to be swappable to from a non-druid class. Unless you were to create lower level polymorph spells or something. Take a look below for the equivalencies.Circle of the Moon is useless without Wild Shape.
Four elements powers suggest that a spell slot is worth 1 + 1 per spell level ki points. Shadow way seems to get a 1 point discount (ie - 1 ki/spell level for darkness, darkvision, pass without trace). Personally I'd be inclined to believe that the four elements numbers are too high and should be lowered! But the higher numbers seem to work better within some limits.Open Hand, Four Elements, and Shadow Way powers all activate off Ki points.
I'm not sure this is a huge problem. TBH, I consider it a fairly weak ability even when you're a ranger.Beastmaster Share Spells is useless to nonspellcasters.
This is kind of down to the weird way that bonus action works. In effect, every character has a bonus action, but only some characters have a way to use it. Cunning action doesn't really grant you a bonus action, it just gives you some ways to use it. Fast hands and mage hand legerdemain do as well. There's no real dependency between them.A Thief's Fast Hands is useless without Cunning Action. Mage Hand legerdemain loses a bit without CA as well.
For spellcasters, solved by allowing expenditure of appropriate spell slots, which flows through to ki expenditure.Sorcerous Origins are useless without sorcery points to activate them.
... and so you're unlikely to take illusionist if you don't have illusion spells - no biggie. Savant isn't a big deal either, since money in 5th isn't a big deal. I don't think that wizard archetypes are losing abilities to gain it.[School] Savant is useless to casters who don't scribe spells into books. In fact, Most Arcane Traditions would be wasted on non-casters or those with limited spell selection.
I honestly am not seeing any balance issues with the rogue-fighter swaps. I think ranger swaps go into that mix pretty well as well.So at best, your going to be re-writing or ignoring huge swaths of archetypes anyway. The only ones that might swap with no problems is Champion, Battlemaster, EK, Assassin, AT, and Hunter. And that doesn't EVEN get into balance issues.
Honestly, unless you want a lot of work, I'd keep subclasses pinned to their proper classes.
That's my point.Yeah, but fighter subclasses get a level 18 feature for their subclass, so I'm not all that fussed. If it seems like a big deal, bumping the subclass feature of a fighter with a rogue subclass to 18 wouldn't be difficult.
That's my point.
A level 17 (or 5, or 11) feature is not the same level of power as a level 18 feature.
If every level was roughly equal to every other level, then it would be easy. But it's not the case.

(Dungeons & Dragons)
Rulebook featuring "high magic" options, including a host of new spells.