The question of "archetype" here, is of the utmost importance.
Namely, does this mean a "magic-using warrior" or a "weapon-using/decently tough magic-user"?
My own, homebrewed, "Battlemage" is more the latter. Allowances for armor, short of chainmail. Swords (any except 2-handed), spears and other single-handed blades/weapons are fair game. Allowances for bucklers and small shields. It also comes with racial and ethnic restrictions (must be from/trained in this particular magic-using nation, only!).
But, like I said, that's my take on the latter.
Or are people looking for a B/X-BECMI "Elf" where chain (or even plate) is ok, bows are ok, 2-handed anything is ok...basically a "Full" fighter with a fluffy spell-casting frosting on top?
Or would a "Jedi-esque" middle of the road suit everyone's tastes...Chain and Scale are ok, but not full on armored/plate...one hand must be free (no or limited shield use) for casting...or innate sorcerer/psion-type "powers."
And then, if you're going to have any of those...is a "Rogue/MU" archetype, for the Grey Mouser and other sneaky lightly-armored,"Arcane Archer"/spell-casting rangers types, necessary as well?
I think it is an archetype that deserves attention...I'm just not sure that anything other than "Fighter/Magic-user" (or Rogue/Magic-user) is necessary.
--SD