Sorry, I only have the one I use, but I know how you feel. I understand why developers want to do it, but DRM schemes in general are annoying to a lot of legitimate users - especially the types that use hardware like this. On the bright side, like Reason this particular key has been pretty trouble free, at least for me.
Good luck with your software if you do get a key, but you might want to consider giving the Reason demo a try too. It's one of the most reliable pieces of software I've used, and if you decide to buy it the key will be included, which should help you with your other software too.
Otherwise maybe you'll get lucky and one of the Balance users will be willing to part with their old key. I don't think you can write your licenses to both at once, although I could be wrong.