A popular mod is to fit ZT door handles, there are even a couple of how to's on the subject,
http://www.mgf.ultimatemg.com/group2/DIY/interior/r75_interior_doorhandle/R75_door_handle.pdf
(my favourite as it retains the rounded handle)
http://www.the-t-bar.com/forum/54-how-tos/36278-interior-door-handle-chrome-surrounds-from-75zt#36278
I have a pair for sale, including the screw cap - £20 delivered paypal gift