We have managed to connect 3 of the I-M223 families -- after about 3 years of combined effort. And it keeps looking like more I-M223 connections are just about to happen.

Update Oct 2022: We have now connected two more I-M223 families. We have made a lot of progress on the Mifflin County, PA, R-M269 and I-M223 families with potential connections but no solid new connections yet.