Replace the original nut and swap it back when you sell. As for the neck, both @mech and myself converted T40s to 5 strings with no issues. Heck I had La Bella Jamerson's on mine 2 years.I'd be leery of the extra tension in the thin Peavey neck and it would be a mod.
Have a noodle neck Patriot strung BEAD.using the bottom 4 from a 5 string set keeps the tension even.
