Hmmm. Could 3 touch-and-go-on-tows be good enough for a 61.56 (nee biennial) flight review?

Used that method to get current again for the 90 day rule. I couldn't find any reference saying that these had to be full-stop landings.
Just coordinate it well with the tow pilot and let him know, that he cannot pull the power as he normally would do after the glider releases, if you are flying anything more slippery than a 2-33 or the tow plane becomes really big outside your canopy really fast!

Uli