Not quite sure what you are trying to achieve but you can use an OSC listener on the preArgs field so you can use the custom module to define how the button works.
@jean-emmanuel : Right, I had the split option somewhere in my head, as we used it in the "ultimate cubase custom module". Now, i remember Thank you.
@Sub3OneDay : thank you. I was thinking, last night, instead of sleeping (...), about using OSC listener, as i have some examples in mind (@gcat custom module, and one mcu CM too i've seen around here). And actually, as i watched the youtube video introducing Flow+, i was thinking... "hey... kinda rebuilding my template in o-s-c could be sooooo... cool-but-no-so-usefull-so-absolutely-necessary..". So... i started this long long journey... One PLE track selection preset, for each track, on a side... one related button in o-s-c... folders buttons... Gosh... that's it... i went absolutely crazy... Drowned into the One-more-button river
This is similar to how I do it. Then it is easier to change things globally like the midi target by using the custom module.
If you give all your buttons a consistent address like /btnCubaseCommands you can filter these in the custom module and send a cc based on their value.