I think you might be over thinking things... I just switch the tyres over. Maybe try to find a good all round setup that works in most conditions? I find consistent driving gains the most lap time as long as the right tyres are bolted on.
I guess if the wet front tyres are larger, drop the front ride height a bit or buy a new set of dry's?
But if you're really into giving yourself lots of work to do, with two completely different setups, then run two chassis!
