Anyone privy to if that would be supported OR would that core only be accessible by that one Apollo?
I don't see any reason why you couldn't 'share' a node from an Apollo. That's the whole idea behind running a node anyway. Assuming jstefanop et. al. get it running on the Orange Pi Zero, the biggest limitation is the storage space; my node is currently using 24G to store the blockchain, so you'll need a sizable SD card. The rest is just network use.