the simplest solution to the EU refusing access to Galileo is to ask for a refund of the money we paid into the EU to fund it in the first place.
You can ask for a refund if your contract specifies a refund. There is no such concept in any of the agreements by any of the participating countries in the Gallileo program.
That is expected - the conditions for Gallileo are the same as a lot of international R&D or advanced tech programs. They are investment into technology and capability, not shopping for Prosecco in Waitrose.
If you decide to drop out mid-program that's it - you drop out. It is like dropping out of University - you cannot ask for a refund for the 3 years of tuition fees and dorm fees because you have decided to bugger off and wave your unruly disorganized hair around the world.
So, sorry, there is no cake. Err... refund.
It was eaten - the money has been used.