Merge Multiple Bamboos

We like to run tests on many different platforms, including Linux, Windows XP (with JDK 1.5 & 1.6), Windows Vista and OSX. The only way I see right now to trigger remote builds would be to write some kind of custom script that lets Bamboo make a connection to the test machine and push a 'build now' and then pull the results. This won't work for us because we want Bamboo running on a publicly accessible box, but the non-Linux tests would run on our firewalled-and-not-accessible-boxes. We can investigate various workarounds to let this happen... but really the best would be if builds could be triggered on their own on the other boxes and then uploaded to the master Bamboo server.