That process looks right. I had occasion to be using my amdroid phone to provide internet while my landline connection was lost, and I believe this was one of the ways I got to continue my bridge sessions and sminars (using RPi4).
Derek
I've since learned that without a data plan in place I cannot begin the experiment. The tether option on my phone is disabled. :^(
I had naively planned to try USB-tethering the RPi4B to my LAN through the phone's wireless, but tethering must mean only sharing the cellular connection.
Too bad for me.
This means I will have to ship the unit unconfigured to the non-technical recipient, so a clearest-possible how-to (like for a gramma) would still be Very Helpful Indeed.
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Oert
I'm not clear on exactly you want to achieve.
Why don't you configure it ar home, take it to site, and there adjust the configuration for local conditions?
Derek