Sixfab LTE + Pi-hole + LiPo Battery + RPi as Hotspot = Mobile cellular with adblock and reduced bandwidth?

Posting this prior to purchase and pursuit to see if anyone has thoughts on whether this (crazy?) idea would work or not:

What if I setup a Raspberry Pi as a wireless hotspot, with its primary internet a Sixfab LTE HAT, but install Pi-Hole on it and add a battery to the thing so it can serve as a roaming adblocked modem. The goal would be to provide Adblocking on the go to cellphones (that might be a bit faster with less to load), plus reduced cellular plan cost by not having a contract on my phone at all, instead using wifi to connect to the RPi for on-the-go internet usage.