These proxies are created for MCPI Reborn or can be used for it. Proxies can be used for transporting players into another server otherwise it being used as a packet translator for another edition of Minecraft.

Proxies for MCPI
Proxy Maintained by MCPI-Revival team? Description Github Link
proxy Yes A Minecraft Pi Proxy to allow players to connect to remote servers.
MCBES No (abandoned) A proxy and packet translator for bridging Minecraft Pi and Minecraft Pocket Edition.

These are the only known proxies that work with MCPI Edition.