Just as you described in point 4 of your reply for the Apple Remote, the IRTrans device ALSO sends IR [repeat] commands to the stereo amplifier until Remote Buddy tells it to stop via the command line utility.

If the time between these repeat commands is similar to the time period with which the Apple Remote sends repeat commands, it’s clear these signals will overlap rather sooner than later. (This is why I asked with which time period the Apple Remote sends repeat commands.)

BUT, assuming that e.g. the Apple Remote period is 100ms, if I chose something like 75ms for the IRTrans repeat period, there could never be an overlap on two successive signals. This means that IF I could tell Remote Buddy to tolerate 1 missing repeat command, it should work, at least theoretically.