It should work - I have a 4g backup Internet connection, that is the same.. its great for when I'm away, I have a couple of VMs running Tailscale that route specifically through this.. in addition, I have some smart plugs that connect through it, that allow me to power cycle my main router and servers.
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How long did it take you to set it all up? When it comes to all this I am literally starting from scratch so I hope it's as simple as installing software without any programming or complex configuration involved.
I brought a cheap 4g WIFI router from Ali Epxress foe about £20... the headset part was just getting the SIM setting, everything else was easy... but I've not tied the 4G directly into my network, rather it's just acting like a wireless hotspot..
Being off the main network is what makes it so useful from a backup perspective.
You will be behind CGNAT and a VPN will work yes but you will need to run a VPN client on each of your remote devices.