Yes you are correct and understand all of the limitations.
I suggest you read all the details from this link as it will help you with any design you take on.
https://github.com/KinkyMakers/OSSM-hardware
More here;
https://milovana.com/forum/viewtopic.php?p=330515&hilit=ossm#p330515
OOps I missed this thread here!
https://discuss.eroscripts.com/t/funscripts-for-ossm/33709