Funny you should ask . . . spent several hours yesterday bleaching and lithing old Brovira, with unimpressive results. Neither copper sulfate or KBr/Ferri responded strongly. These were grade 1 and 2 papers, which might have something to do with it.
I have lithed the Brovira in higher grades, and also the MCP in fiber form, but I don't know if either had changed to an emulsion with developer incorporated. For a quick test: Place a drop of "B" or NaOH onto a test patch, with the lights on. Devolopment indicates developer incorporated, and will not lith. Additionally, it is a legitamate question as to whether processing these papers will kill the lith effects of your lith developer. According to Rudman's book, if you want to switch from lith printing to conventional printing, simply add a little conventional developer to the lith pan. I hypothesize that adding a developer-incorporated paper to the lith pan will degrade the lith developer.
So, I would do the quick and easy test first.