I'm not sure this is the syntax that I would have come up with, but I
guess it's too late to put the genie back in the bottle, so this PEP
should have some way to cope with these things?

why would this PEP deal with this?
the higher level PEP that builds on top of this would bump the wheel metadata version (probably to 3.0, due to the jump to 2.0 already)
*then* tools will cope with this based on the metadata version