I suppose the combo port could be problematic, depending on how it looks to the OS. VyOS doesn’t like network interface changes after all.
If userspace sees it as the same interface regardless of whether you’re using the SFP+ or 10GBASE-T port, then it probably won’t be a problem. If not, it might.
For userspace there is currently the same port/interface as userspace does not see the sfp or phy…only the mac. Possibly this changes because of the phy port representation but i have not yet see patches for the mux itself.
I have a piece of bpi-r4-pro hardware, and I can provide a Windows remote debugging environment for bpi-r4-pro