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
@Canoziia Is there a reason you’re checking out the current branch of vyos-1x instead of the rolling branch? The latter seems more up to date. 
Also, it seemingly breaks the build for me now as some part of the build switches over to the rolling branch anyway and since the script explictly only clones a single branch it fails when it wants to git checkout the rolling branch. I didn’t have that problem before, despite no changes being made to that script since the last time I built it successfully. That makes me think it’s a change elsewhere.