All good.
Nope, this came to be as the author of Musicbee had little interest in screwing around with xml syntax changes for programs he does not use (and which admittedly each come with their own clusterf*ck of ok to just badly written xml interpreters).
So I then wrote this over a few days, and wrapped it up into a basic UI so others could use it as well - but, that also means it's a) stand-alone / not integrated in MB [so no to "so that Musicbee keeps the code when I close it?" - that is impossible as is], and b) relies on a given MusicBee xml syntax; and c) you willl need to run it on every xml that you want to drag from MB to RB. So I usually do this 2-6 times per month, depending on how much new music comes along & when/what I want to play out.
c.