Therefore IRQF_DISABLED _will_ be forced on everybody some day soon, and
I'll provide an IRQF_ENABLED for use by broken hardware only (and make a
TAINT flag for that too).

I don't think you understand how the kernel project works. If everyone
thinks your change is inappropriate it won't get in. You can talk about
forcing things all you like but "force" used that way generally means "new
maintainer required"