The Potty 1 wrote...
Cool idea. I don't have BG1 installed and probably never will again, but it sounds interesting. As always, it will make some fights trivial, and others really hard. glitterdust, 2x sleeps, web, grease, and stinking cloud all cast simultaneously should knock out most low level enemies, and then you can finish them off with agannazar's scorcher and darts. Until you get your full group of 6, sleep is your best bet because it's only level 1, and enemies have to save at -3.
I soloed a Mage/thief through BG1, and he was really powerful. Pure mages will be tougher, and you may struggle with traps, but it should be perfectly doable.
Regarding Dynaheir/Edwin, you could install the happy patch? Given you're using Neera (wild mage romance mod) you must have either easytutu or BGT, so that's OK. Alternatively, you could dual class Imoen to mage at level 2, find another caster mod, take a bard (Garrick or Eldoth), or Quayle (cleric/illusionist).
I played with the idea of dueling Imoen into a mage, but i decided, if I want a challenge I might as well go all out lol same with Quale and Garrick.
As for Mods Im playing EE on my ipad (very strange getting used to playing on a touch screen and can be alittle buggy at times but is working quite well since I can play at work

) so no mods for me.
Ive read that at some point Dynaheir/Edwin will fight, but ive noticed something, if Dynaheir dies in my party (from an enemy) edwin gives his speech 'glad shes dead now you get my wizard powers for a year' is this a loophole of some kind to make him think she is dead even if I bring her back? (false hopes im sure

) worst case, they end up fighting and one dies, ill have to end up with Quale instead as he is the closest thing to a full mage in the list.
UPDATE:
My team is now in the Nashkel area, after getting to the friendly arm inn Xzar and I went south and found Neera in Beregost (I actually had no idea she was there when I happened upon here lol) with our team of 3 we traveled south useing ALOT of saves and rests for magic, and reloads until we made it through the gnoll stronghold with Dynaheir. Afterwords Edwin joined to 'keep an eye on her' lets hope my 18CHA helps this out even though its probably futile. Now with a team of 5, we travel some of the easier areas searching to get everyone to at least level 2 before entering the mines (Note: when Edwin becomes lvl2 ill be only a couple hundred from lvl3)
Me - lvl2 Abjurer
Xzar - lvl2 Necromancer (currently dead, leaving him that way for a little bit to help the other mages catch up lol)
Neera - lvl1 Wild Mage
Dynaheir - lvl1 Invoker
Edwin - lvl1 Conjurer