J.P.,
Basically the (red) lenses <<can>> be separated from their chrome bezel ... you just have to cut it out carefully from the inside, e.g. with a Dremel, a small drill machine.
However, the inner "glued-in" edge of the lens is then gone away. After rechroming you then need to glue the lens in again - basically in the same way as the new reproductions.
I have not done it yet but will try in the future.
It is probably best to try it first with a less valuable older SL lens before you use your fine flawless ones.
:oops:
Best,
Achim
(parts & knowledge collector)