It makes no sense to derestrict a Class 3 e-bike IMHO. The air drag above 25 mph makes it hard to ride any faster unless it is a tailwind or downhill ride. Riding at the top speed range is also heavy on the battery consumption and on the drivetrain, both being costly in a longer term (battery and drivetrain degradation). I own and ride a 45 km/h Vado and never thought I would like to derestrict it.
Derestricting 2020 Mastermind e-bikes electronically appears difficult because of the data encryption in the system. Mechanically? Did Alex of PLANET3.BIKE confirm he could handle new Vados? Derestricting the new Vado mechanically will produce crap on the display, undermining all benefits the new Mastermind can offer.