There are alternative options, although they will take a bit of time and effort in order to set up and use.

The easiest way to stay synced with the network without an internet connection is via Blockstream Satellite. It is possible to repurpose any old satellite dish in order to do this.

In order to broadcast a transaction, you need to get it to someone with an internet connection. This might be someone who has bypassed government restrictions, or maybe someone who lives near a border and can use the connection of another country, or someone outside your country altogether. You can get it to them via a mesh network such as goTenna, via SMS, via radio, or any other way you like.