Ahh, typo, I meant 120 m. Actually as it is 120 m above the surface, it is possible to set the operating ceiling above that and still comply, if you are flying up hill. Another reason to descend on the RTH, though that would always need to be set with consideration of gradient and obstacles.
You're right that you can reduce height then select RTH, but descending is a slow process in itself. Your solution would help with wind but it would be fighting the wind as it dropped unless you are manually steering it home at the same time, but then you're just reproducing what could be an automatic and better controlled flight.
LOL why did I ever start this thread.
