I ended up doing something very similar, if for different reasons. There was an elongated period of time when I had no home Internet service. It was more or les

I ended up doing something very similar, if for different reasons. There was an elongated period of time when I had no home Internet service. It was more or less a nonissue, since I had 5GB of LTE-speed tethering, and most of my devices spoke Wi-Fi. Note that I said most, not all. I had a few Raspberry Pi's, and an old Xbox and 486 PC that I used for old games. I ended up using DD-WRT in access point mode, and rather than having it run in station mode, it would connect to my phone as a Wi-Fi client, and forward Wi-Fi packets out the Ethernet switch. It was quite handy, and made the summer much more bearable. As an added bonus, I now keep that router config as a backup. If my actual ISP is ever having an outage, I can reupload that config, and get all of the devices on my network back online, without having to switch them over to Wi-Fi.