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I would keep it simple... community can make levels in Unity's own editor... then all problems are gone... I think that it will be a lot easier to make levels in Unity as I can do modelling in whatever software I want and load it to Unity's editor and then save them as Unity's and simply load them in FPV Freerider... The editor is there for us all... and it's free... no need to complicate.

I agree, to use Unity's own editor would be the best and simplest way.

Unfortunately it is not possible to load external Unity scenes into a finished Unity build. At least I have not found a way to do that during my research, so if you know a way I'd be interested to hear about it.