2 stroke endorsement intrigues me. I leant to fly Group A in a Tecnam 912uls 4 stroke but do I have a 4 stroke endorsement ?. i learnt Group D in an Aerochute with a 503 2 stroke but I don't physically have a 2 stroke endorsement. Whats hard about a 2 stroke - plugs, fuel and air filter , gear box oil. lot less maintenance than a 4 stroke.
With the x-air question, if you hold endorsements for the configuration of the Aircraft that should be all you NEED but flying with someone experienced would be a benefit. Plenty of upper air work to sort out stall and glide speeds at different stages of flap etc.
What if your getting a single seater, what could you do then.