I'd say just go full wizard. And take wyll for face checks.
I don't think that works...for one your companions are different people with their own personalities and opinions so they won't have same dialogue options like you, not to mention you can't speak through them during important story moments, and there will also be scenes where you don't have any companions like when speaking with people at camp. So no, I really wouldn't even attempt to try to make this work via companions at all...that will be very limited at best. No, it's far better to focus your main character on being the face and then if you want to play wizard that's what Gale or hirelings are for. Pretty much any other role in the party can be filled by companions but not the face...that has to be your character.
