Or would I have to rout/get someone to rout out the body to be able to put a single or 'bucker in the middle.
so you to route a mustang for a middle single coil sized pickup?
i dont think that will give you much diversity unless you were to add a another switch or tone knob it wouldn't be worth and it looks like ####.
as bandit said why not just get a cyclone or a strat.