Just swap mac address if you have to use such a wifi. Or set up Xray[0] with the captive portal as domain if you have a VPS and are so inclined. Can also use this on locked down airplane wifi.
Just get a good 5G plan? On the ground in a busy metropolis like London, I can't imagine why or how you would need to consider using satellite communication for connectivity. Then again the last time I was in London the cellular service was by and large pretty bad.
I get a better 5g signal on the Jubilee line than I do on an overground train.