They could play their Super League games (*) in one stadium, PL/FA Cup/etc games in the other. Seeing as it would likely be two separate squads, it would kind of make sense to the money grabbing [Poor language removed]I doubt the RS would spend money on a smaller stadium, unless they have the intention to use it for their women’s team and u23 sides.
It will cost them a lot more than Bellingham would have.
(*) Presuming of course that they don't blow their transfer dealings as badly this summer as they have in the last few windows.. or else they'll have to appeal to the powers that be to make special allowance for them to be allowed entry