You could fit 600mm crank arms
If its be designed to stop tampering then they have been successful.
I derestricted my Trek bosch ebike very easily to see if i could.
Wheel magnet and frame sensor.
Moved magnet to crank and then set the sensor to pick up the new magnet position.
Suddenly had a near 30mph bike that said it was doing 7mph.
Now bosch have put a stop to this with the new system as have specialized, which i have now.
I dont agree with de-restricted E-bikes btw, fookin dangerous to you and others.