While you can not do Spell Combat, There is still a big loophole that will still make this a very good build: Spellstrike.
"At 2nd level, whenever a magus casts a spell with a range of “touch” from the magus spell list, he can deliver the spell through ANY weapon he is wielding as part of a MELEE ATTACK."
Caps by me.
This means that, while you cannot do spell combat with, say, a greatsword, you could, at 2nd level, do spellstrike.
If I am missing anything, i am sorry. I actually thought of and built this build yesterday, have yet to try it.