Well, the thing I want to see isn't really around in 5e either: a proper swordmage.
There is the magus, but that's not what I want. The magus is a class that sometimes hits things with swords, and sometimes casts spells.
Since I don't play 5E I can't say if this is exactly what you'd want but it is the concept of a weapon mage:
We've got an Elf Rogue in our group that took the Ancient Elf heritage. That lets you take a dedication feat at level 1. He took Magus.
He then took 'Even Weaponry' for the ancestry feat, and tumble behind for the class feat.
For his rogue Dedication he took Wizard -> Transmutation.
Result is a rogue with an elven spear and 4 cantrips: Telekinetic Projectile, Produce Flame, Shield, and Light.
Often in a turn he attacks with the weapon and one of the two attack cantrips all in the same turn.
- The flaw in his design is that these spells require spell attack rolls, so he's going to be suffering multi-attack penalties on either the spell or the spear. He could solve that by using a spell like electric arc instead. HOWEVER if he did that, electric arc gets a reflect save. And as he levels his spell DC won't scale very well. So he's banking on being able to make to-hit rolls reliably instead. I'm not sure if he's doing that right - time will tell.
I'd build this idea out to level 10 in pathbuilder - with spells that have saves and spells that have to-hit rolls, and see which has better odds.
Cantrips scale very well in PF2E - so this character has a lot of poential. And if he flanks, his spear will be getting sneak attack bonuses.
The spear is finesse and reach - so he can make attacks with it from 10 feat away.
All in all it's a solid concept. One could go rapier or short sword instead if they really wanted a sword - that would mean they didn't need to 'elf weapons' feat so they'd have room to get a different feat there.