As far as I know, the Ercoupe is in a class of its own and if you learn to fly on it, you basically get a licence to fly the Ercoupe.
With regard to cross-wind landings, they designed it with a particularly sturdy landing gear, so that you can just crab the aircraft right down onto the runway.
Cross-wind take-off might be tricky, I suppose, given that you cannot apply into-wind aileron without yawing in the same direction. It would be interesting to hear from an Ercoupe pilot.
Deeday