All those Zenith high wing STOL airplanes out there, all those Cub-ish replicas, the Bearhawks, the Murphy series, etc. could serve as E-AB towplanes for various (appropriate) weight/speed gliders.
Heck a Kolb Mark 3 with a 912 on it would be able to tow the GOAT series of glider, and create an entirely new "movement" where the GOAT can be slapped together within a month by an ultralight club and towed safely by any 912 or 582 powered UL.
Anyone who is at Oshkosh please stop by and give Murry (MM4440) a hearty COVID-safe handshake and thank him for his work promoting this concept of towplane permission. He's been pushing on this door for a long time, and it needs to be pushed open. This is genuinely the key to a whole sector of greatly reduced flying cost for people on a budget.