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I've not read the whole thread so this suggestion may of been made I don't know.
I'm starting to get spammers too and was thinking of a way to cut down on it, now we could use capatcha images, but some bots can crack this too, we could also consider another joint options.
Capatcha +
A hidden field titled something like username, password, something which the user doesn't see and doesn't have to fill in, I believe it could be done so these automate bots do see detect the field and fill it in, so you apply this rule:
If field contains data refuse submission, else allow.
because this field is invisible to humans on site, the field should not be filled, but when bots detect the field and fill it in, the system would know it was spam, the spam bot would think it's submitted when in fact it isn't.
Could this work?
And if so could it be implement in core registration and perhaps modules?