Is there such a thing as a 5000 stall converter that is streetable ?

This just isn't true. You really need to read up on modern converter technology.
^^ This ^^ Years ago I bought a B&M "3500" rpm stall converter and put it behind a mild 440 in a 71 RR, it was pitiful. My current converter that flashes 5600 has way better street manners.

I bet when the guy that had the idea for the wheel told his buddies, they all scolded him and told him it wouldn't work. Then proceeded to stick their heads back in the sand! LOL