Gig 601Xl Builder wrote
Let's say a person holds a Private A-SEL and Rotorcraft-Helicopter but
has chosen to NOT get a medical and flies LSA class fixed wing
aircraft. Can that person fly and Ex-HB Helicopter without a medical?

NOPE! But the regs do permit a Private A-SEL pilot to fly it without
having a Rotorcraft-Helicopter rating. That's what the reg says, however
I understand that to deal with this loop-hole, that the FAA individual
who "signs-off" the experimental helicopter usually writes into the
operating limitations that the pilot shall posess an appropriate rating.

Bob Moore