"As from a quick scan of the thread, openmpt is used by WACUP so that's one not needing to be suggested

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Yes I saw this, and also liked, because I prefer libopenmpt instance others mod libraries.
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My first idea was to provid two separeted installers for WACUP, but after your comment I realize because the little size, it can be in all installers.
I also think, not all users will be interested for those plugins, in the way at the install process there should have one option for install those chiptune plugins, this is more profissional in my opinion.
great your interest on those plugins. :p