The Grove setup is not cheap, but the STC Cleveland stuff is really, really expensive. The wheels with the AD, when you find them used serviceable, are roughly the same price as new Grove wheels. And then they crack.
If you do try for a field approval, you can legally use the non-TSO parts, but Grove cannot sell them to you. He can only sell them to an experimental builder. Strange, but that is the way the reg is written.
Same with radios - Garmin could not sell me a non-TSO radio, but Spruce could.
If you go for the field approval, we have pilot reports in writing raving about how much safer and better the hydraulics are. Push “safety of flight.”