If Adam's suggestion does not pan out, you can buy a universal remote that outputs RF only. That assumes a blaster/receiver with an emitter stuck to one of the TV's IR sensor. I do not have a suggestion for you on which to buy. My own is the RFS200 package ($76 atm) but the problem there is that it outputs both RF and IR simultaneously.
If you can afford that, and find that you can't afford an RF-only-capable remote for some reason, then you can cover the remote's emitter with something thick, I dunno, duct tape perhaps? This method requires use of at least two remotes. Otherwise, with an RF-only-capable remote, you might perhaps be able to control one macro (first TV) with IR functions programmed, and the other macro (second TV) with RF only for example.