Looking at the problem, I think the fastest solution to upgrading Twelpers for 2.2 would be for me to just do it by hand. I'm happy to do it, if you don't mind.
I can do the upgrade on the currently released version, or on any in-development work, if you wish. Feel free to reach out to me directly, I can be reached on reddit at /u/CommodoreShawn or CommodoreShawn#6231 on discord