No direct recommendation as I didn’t use any of them personally, but I think there are USB powered GSM routers that then open up their own accesspoint. So basically the Pi supplies power through USB and then connects to the stick using WiFi: https://consumer.huawei.com/en/mobile-broadband/e8372/
I guess the setup is then just to configure the stick so it automatically unlocks its SIM card, set a strong WiFi password and then configure the Pi as usual.