I’m not entirely sure what your asking for.
Would you consider using a TCP port, which opens up the possibility using multiple connections to your Velbus network.
Maybe Jeroen’s VelServ ?
https://forumtest.velbus.eu/t/how-to-install-and-run-velserv-a-velbus-tcp-gateway/15422/21
As for the functionality you’re looking for, would you like to start a separate thread on each, so you / we all can explore and contribute?