Anything can be circumvented, VPNs, Tor, I2P, and some other more unknown apps like briar. The issue will become will using those services become illegal too, and the barrier of entry becoming too high for those outside of the technical world. Signal will definitely just pull support for the EU, so you'll have to trick it into thinking you're not in the EU. But now you're at risk of running a foul with the law.
Anything can be circumvented, VPNs, Tor, I2P, and some other more unknown apps like briar. The issue will become will using those services become illegal too, and the barrier of entry becoming too high for those outside of the technical world. Signal will definitely just pull support for the EU, so you'll have to trick it into thinking you're not in the EU. But now you're at risk of running a foul with the law.