The only "stink glider" I've owned had a Wankel, and I felt it a good decision. It would climb to over 12,000' if necessary to get over a ridge. Cooling (systems, time/power/speed management) is a concern with the AE50R.
Seems one problem with all 2-stroke engines in gliders is that the fuel must be put into the tank as premix. If you don't use it, the fuel and oil will separate and you'll likely be burning the wrong mixture. Once did a test run on a sustainer for 1/10th of an hour, still unable to produce sufficient power.
Motorcycles have been using oil injection technology, but only for a few decades.
A few friends have JS-1Js which are very simple, quite reliable and produce enough power. But they're thirsty and noisy.
The newish European retrofit jet kit doesn't appear to have enough thrust or burn time for Southwestern US conditions.
Wanted to visit the (not allowed to mention here) factory during a day off in Kaunas, Lithuania a couple of weeks ago, but there was a directors meeting that afternoon. They have a very interesting approach.
Jim