I mean, it’s not a terrible idea... front bar 2h for the increased spell damage and slot melee skills, back bar destro staff for the effective abilities from that skill line. I guess I’d caution what kind of challenge you’re looking for here though haha. I can’t say playing such a build would be particularly hard, but it’s more or less taking a stamina based skill line that’s not optimal for pve and putting it with a magicka based build that’s not especially great in pve rn. If you’re looking for a build that’s challenging to play, I’d go with magblade. If you’re going with an intentionally unoptimized setup just to see what you’re able to do with it, then you’re right on the money!

Re: skills: power lash, burning embers, and engulfing flames are all close quarter skills and bread and butter for magdk dps, so I recommend putting these on your 2h bar. Rearming trap is close range, will buff all of your critical damage, and make your light/heavies with the 2h hit for a pittance more. Then flames of oblivion so you get additional weapon critical. Backbar could be eruption (another staple for magdks), inner light, elemental blockade (staple for all magdps), harness magicka, and igneous weapons for the major brutality on front bar. I’m guessing ults would be a toss up between elemental rage/shooting star/standard of might.
Re: cp: still treat it like a magicka build. I wouldn’t put any into staff expert, but instead any from there into master at arms to buff your 2h hits too. Otherwise yeah, elfborn, thaumaturge, elemental expert for blue. Red and green are basically gonna be the same for any mag class. You shouldn’t need any in mooncalf since you only have one stamina sink.
<<Edit: I’m also guessing you’d want to run the lover Mundus stone with this since it benefits both physical and magical damage, as opposed to either the apprentice or warrior which only benefits one, so you probably don’t need any into spell erosion if your group is applying major breach and you’re in 5 pieces light armor>>

If you get good results from your build, let me know! I like wonky theorycrafting, but I’m still a little skeptical here haha

I guess the question is...why? You could do dual wield and get another set piece. You can run two 5 piece sets and a monster set using dual wield. With dual wield swords the twin blade & blunt passive is pretty good too.

Yeah, 2h will grant you slightly higher spell damage on front bar and a bit of splash damage, but with dw you can have two full 5pc set bonuses and a full monster set active, along with two enchants (and two weapon traits). Imo dw is the way to go performance-wise, but if your goal here is to be a flame mage swinging around a huge sword, you can definitely play overland content and probably most base game dungeons that way.

Just a guess based on the description of your build

In pvp, you can run a 2H for forward momentum. Thats pretty good

Two-Handed Weapons (2H, Bows, Staves) now count as 2 set items, not one.....does this change things for me @jypcy

Opens up new set combo possibilities for you but I wouldn’t see that really changing your skill loadout or cp distribution. Dw would still enable you to have two enchants rather than 2h’s single one (unless that also changes), but as this is a “play your way” type build, that shouldn’t matter.