Hello,
FoxGuard (https://forums.spongepowered.org/t/api-6-x-7-x-foxguard-the-flexible-world-protection-solution/9952), has planned support for poly regions, and Fox (the creator), says it should only take a few days to do, however he is in uni, so that time frame might be a bit skewed. Of course, this won’t be able to read existing worldguard regions, so you will have to reset them all up…
If your interested in using it, give me or @gravityfox a poke.
–Snowie