"Orbits mean frequencies"
The procedure for registering satellite frequencies is well established, and quite rightly if you don't use them you lose them. Of course. Nothing you have posted there changes what I said above.
These are not the only satellites and not the only frequencies. They are not the only game in town. There is no closing date for applications.
We have no idea at the moment whether we need satellites, and if so whether these frequencies or these orbits are suitable for what we might need.
First we need a user requirement, not some political adviser's daydream. If we actually do need satellites, we can build our own in the UK to do what we actually need, and get suitable frequency assignments for that purpose, which may very well be different from those OneWeb have obtained. As you have correctly said above, launches are easily sorted so we can get satellites launched to secure that spectrum.
I ask yet again - where is the user requirement?