If someone can help @egrootoonk please post in https://forum.mysensors.org/topic/10058/sensebender-micro-sketch-and-library-files so we don’t split the conversation.
I've ported SensebenderMicro.ino to MySensors 2.3.1 and PlatformIO. You may check it here: https://gist.github.com/radek-senfeld/ac829f6ef117bd04638659709b51e9e9
It's deployed on one of my SBMs for just a couple of minutes so.. here be dragons! :-)