Yes Bees need our help
The Snowdonia Society sell over 40 varieties of bee friendly seeds
although they will not sell abroad in case it introduces non native species.
Armin, you are addressing something important. For example. Last week I was in a gravel pit that had been abandoned for 10 years and admired how the plants were reclaiming nature. And rare species get a change again. I wouldn’t sow anything here.
A nice idea in general. I can imagine to join the club
Same caution goes for alpine environments. Flowers there are highly specialized to the harsh conditions and “intruders” might cause more troubles.
Apart from the fact that - as far as I know - bees have only about 1km of flight radius around their hive so high up on a mountain might not help much. But near the parking spot could be a nice addition.