I do not think it's worth it.
First, you will make your spell and BAB progression lag one level behind a full magus, which means:
Each three levels, a full magus will cast a spell level superior to you, which will be A LOT more powerful than a mere +2
Each four levels, a full magus will have one more attack per round, which is ALSO more powerfulk than a mere +2
=> This means that at levels 1,4,7,8,10,12,13,16,19 and 20 you'll be obviously weaker than a full magus... that's 10 levels out of 20, half of the time
Then, second, even on the remaining levels, you're going to have less spell slots than a full magus, on a class that tends to be spell slot starved due to trying to cast a spell each round without having a full spellcaster pool... which is an advantage that is going to grow at each level, in exchange of a -static- +2 bonus... well +1 to hit/+2 to damage in fact, because of your -1 BAB
And, finaly, the worst of worst: if -ANY- of your teamate starts to provide morale bonuses, your +2 is going to be overwriten by it, and all those losses would have been just for... nothing.
Probably nobody ever tried it, for those same reasons.
