Metal Mice?

so i need a metal mouse, not the frame but the surface your fingers rest on, i seem to have some sort of medical issue about extended contact with plastic, could also be the antimicrobial coatings but as its happened over several different mouse brands i assume it is the plastic. my pointer finger and thumb feel as if they are burning and i was hoping that someone out there might have an idea as to a make and model mouse i could try, ive been contacting most of the common mice manufacturers for help.. i am gonna have to go out and make a new shell for my mouse out of metal by hand..... so please any help would be great