Using 2 alternators .....

You cannot make something that is round.....more round.

It takes power [ not much, but some ] to drive the alt. So if you are spending money to improve engine performance, & then take away performance with an unnecessary alt, then it does not make much sense...
Unless performance is not the goal. OP wants "to make the engine more symmetrical, more pleasing to the eyes.." You gonna knock him for painting it olive drab too?