I doubt that remote codes can be changed as it would cause horrendous service problems when people's new TVs didn't see the new remote cause someone at the store messed it up.
We are planning to get a second DTV converter so Sue can record one program and watch another, and we'll have to get a different brand from our current unit just for that reason, so that two remotes won't work two boxes at the same time. If the rest home provided the TVs, it should be there problem to provide two different brands in each room. I wouldn't be surprised if some manufacturers make TVs with that capability for just that situation, but I doub the average boob tube can do it. Tom Fowle