Many thanks to those that answered my question on bleaching.
The information, comments and warnings is extremely useful and confirms my expectation that this is going to be a very delicate process. But, the fact of the matter is that unless I somehow treat these single-copy prints, they will remain of limited value.
I have now found a darkroom here in Montreal that has a sink big enough for me to lay the prints flat, so that I will have a much better control of the process than with the roll-unroll-reroll process. And I will have the assistance of someone who has quite a big of experience with selective bleaching.
Wish me luck...
Guy