At the extreme magnifications you need, they will introduce aberrations, especially lateral colour which will show as coloured edges. It sounds like a job for a probe or borescope lens. I just today transferred footage shot with my Aaton and a Nikor 55mm macro lens of an eye. It is incredibly sharp and certainly much better than past results with diopters. This is very subjective.
Diopters can look nasty on a zoom.
This might be out of your budget, but the ARRI Shift and Tilt System allows for some really cool close-up photography. PLUS there is a PL mount adapter that allows you to mount any PL lens on the Shift and Tilt bellows stage. Of course, a simple ARRI Macro lens would also do the trick. They are very popular because they automatically compensate exposure when you change focus, allowing you to concentrate on more artistic issues than having to calculate magnification ratios and exposure compensations. If you get closer to a subject, less light comes in, so the ARRI Macros will open up the iris to maintain the same T-stop.