Hi Ed,
I did the removal of the original iris connection on the FD 85/1.2L non destructive as well - but I don´t want to try to reassemble it back to original FD at the moment. Would be more work than to get it out of the lens.
Your idea with the back lens sounds good. But I have - as always :-) - some doubts about the precison of the parallelism. But OK, the approaching second lens is pretty much parallel. The idea is great!
I think with this mail potential problems with the Lens Docter should be cleared - as long as he performs reversible lens conversions. I suppose he don´t :-/
Impressive lens collection!