Remathilis
Legend
When it comes to artificer spells, there are two important things to remember. First, the actual artificer list of spells is quite small, only affects objects, and generally takes a minute to cast. They're helpful, but they aren't flashy. This would probably be represented in 5e as the half spell progression. Second, artificers are considered to have every spell in the game as far as prerequisites for making magical items are concerned. Which means that an artificer can create a scroll of any spell in the game, even 9th level, and they can craft wands, staves, rods, cloaks, whatever during their downtime. So, he can make that Staff of Healing or Staff of Power or Scroll of Forcecage or Scroll of Wish or whatever, and have access to all that has to offer.
Which is why a re-look at magic item crafting would have to be considered, of course.
And this is where the "revamp" portion comes into play.
The artificer list should remain small and tightly focused, but I'm not entirely sure 1/2 caster is the best method. I was using warlock progression for my idea, but that a bit faster than paladin/ranger. Ultimately, I think the artificer should fill the same niche as a bard; a mix of buffing and healing magic with a side of creation and the like. If bards can be full casters, artificers should be too.
Second, I'm not sure the "ever spell in the game" requirement is needed or wanted. Emulating spells (via UMD) was needed due to how crarfting works. It's not needed anymore; anyone with the formula and proper spellcasting level can do it. Therefore, they don't need to have access to said spells; but they still should be able to use said items. (Giving them a rogue's Use Magic Device fixes that problem easily, the rest is all formulas and levels).
Lastly, I don't see a revision to crafting happening anytime soon. Which is why I suggested making magical "gadgets" that emulate items but are really part of the artificer's class power, rather than actual crafting. That way, the DM can use the artificer class with the DMG crafting rules or not and the artificer still "feels" like he's making cool toys for himself and his friends. (Those toys are paid for in the artificer class itself, rather than with GP or time). Power level wise, he's on par with a warlock (who gets invocations that are paid for in warlock power). So even if the DM doesn't use DMG crafting, the artificer is still "making stuff" since his magical gear is "baked in" the class itself.