I think two servers can decide which protocol to use to pass data to each other, I think Semisol's proposal (1671) goes in that direction. The iroh thing seems to have good participation here two other things I've seen recently
I saw this projects
github.com/duozhutuan/NostrBridge maybe Scornful Chimpanzee
can say more
also pocket relay github.com/StevenDay83/pocket