RAL. Mirroring registers with the same addresses

I have DUT which contains 2 registers (A and B ) with the same addres. DUT also has the third register © which control to what register write: to A or to B.

Using RAL we have problems with mirroring registers A and B, because they have the same physical addres.
How caw we solve it?

I found a way which works:
1) give registers A and B unique addresses
2) make register adapter to change address using register C