Correct the new remote can be paired with the built-in receiver no need for external dongle.
You might be better asking in the Vero V support Vero V - OSMC Forums
I understand that only works with the Vero V along with the remote that comes with it.
Correct it’s a 1 to 1 relation
You could (but it would void your warranty) replace the internal receiver with your custom receiver but I would not recommend opening the device.