you are asking about reshelling them with stock shells right custom molded right? if so i dont see why not. the main the i think that sets the ltd vs the regular versions apart from eachother are the nozzle acoustic dampers. so if you wanna keep the sound i would remove those intact.
yeah you shouldnt have a problem, but like i said that acoustic nozzle filter is A MUST! if you puncture it or break it, they are very feagile and its easy to break it, and shure doesnt or wont supply you with more.