Unless there is a specific reason such as only the LHS having a tiller and/or brakes and the FO isn't checked to operate these then I'm not sure why that would be an issue.
I also agree with Judd about competency. It should also go to reason that said captain would have spent considerable time in the RHS before they progressed to the LHS and has done his/her fair share of OPC's whilst a FO, so a quick RHS check should only be a formality to get that muscle memory going again if it's been a while since flying in the RHS.