I have a customer who LOVES Starbuck's Lemon pound cake so here is what I was thinking:
2 - layer lemon pound cake with the lemon glaze covering all over,
plain Bettercream filling,
cover with fondant right over the glaze and then decorate.

Will this work?

They don't have an aversion to butter cream or anything, I was just trying to replicate the lemon pound cake experience and still be able to decorate it.

I don't see why not, as long as the glaze is fairly sturdy, will pour on cleanly, and then chill before covering in fondant...