@jcozar cool, both of those should be fairly straight forward because they are based on the H3 Chip. However, I have read that for the OPi Zero the out-of-tree wifi driver is very unstable, to the point where Armbian recommends not using wifi at all on that board.
With regards to the GPU on the PC Plus, I think that might be pretty difficult mainly because the newer kernel versions for the H3 are all mainline linux and the proprietary blobs for the Mali GPU will never get accepted into mainline. I have spent some time looking around to see if anyone has managed to patch GPU blobs in to a newer 4.x kernel, but haven't turned up anything good yet, as far as I can see GPU is only working on the 3.4 kernel and unfortunately that doesn't have the necessary prerequisites to run Docker, so resinOS can't work there
In any case, I will probably try get a hold of an OPi Zero board as it looks pretty straightforward.