OK, I've updated the packages at the temporary apt URL from my last message with some changes that I've pushed to the VCS branch proposed-consolidate; there is now a transitional chocolate-common and I've tested the only-chocolate-heretic upgrade case, all is well.
I/we still need to bring back most of the chocolate-doom.install file now that we're back to a multi-binary package, otherwise I think it looks good.
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