I have an idea to derestrict the bike without having to damage the original setup in case you want to go back. You remove display, controller, pedal sensor, basically the guts of the bike but leave the motor in place. You may have to cut the battery wires and add connectors for those as I think they are just soldered. Basically buy the connector the same as the motor, I believe this is the one
https://www.e-bike-technologies.de/index.php/en/cables/motor-cables/higo-l1019-detail
Buy a suitable unrestricted controller, display and pedal assist to match, solder connectors onto the motor wires and battery terminals to match the controllers inputs. Then plug everything in and fit it. You will now have a speed configurable setup with the original motor and battery. Its a fair bit of modification but it's the only workaround I can see working. Of course this sort of tinkering will void the warranty, there is some sort of anti vandal style paint under the controller which I believe is to show tamper evidence. I may try this, I may not. Tempted to just buy a second 1500w toy as the police don't seem to care here as long as you ride sensibly...
https://www.e-bike-technologies.de/index.php/en/cables/motor-cables/higo-l1019-detail
Buy a suitable unrestricted controller, display and pedal assist to match, solder connectors onto the motor wires and battery terminals to match the controllers inputs. Then plug everything in and fit it. You will now have a speed configurable setup with the original motor and battery. Its a fair bit of modification but it's the only workaround I can see working. Of course this sort of tinkering will void the warranty, there is some sort of anti vandal style paint under the controller which I believe is to show tamper evidence. I may try this, I may not. Tempted to just buy a second 1500w toy as the police don't seem to care here as long as you ride sensibly...