The vendor technical lock in side is difficult - there is lock in because they have developed a service to differentiate themselves from the competition....
You can reduce the lock in by reducing their feature set to a reduced level - most multi clout implementations basically use containers to do everything I think?
I think you are getting confused between geostationary orbit and legrange points.
Geostationary orbit is just the narrow band where you can have a stable orbit at the same speed as the earth's rotation (so it stays in the same place in the sky) no other gravitational bodies involved.