The "trick" is registering as argo equipmet. No, Im not kidding. There is a special EU T3b agricultural tractor vehicle category with very little requirements. The most painful one once you inevitably get stopped by police will be 90km/h hard speed limit everyone breaks/removes after certification process.

This is how people make ATV/Quads/custom 4x4s legal in strict countries like Germany where normally you cant even put a non TUV approved sticker on car bodywork.