If it was bigger and could operate as a secondary device to another (smaller) iPhone, sure, but those are the problems for me.
I can’t speak for the OP, but I like the smallest possible phone when I’m out and the biggest possible handheld device that can double as my phone when I’m home (via continuity). Right now I have an iPad mini but it’s too wide to hold like a phone comfortably (by about an inch) and too wide and tall to put in my lounge pants pockets comfortably so I have to carry it by hand around the house. Awhile back I tried using an iPhone plus as my large device at home, but besides being a bit smaller than I wanted it to be (it could have been an inch wider and still comfortable to grasp), the bigger issue was that it wasn’t designed to be a secondary device like the iPad. I couldn’t make outgoing calls/texts, and most other continuity features didn’t work, so I’d end up carrying both my small and big phone around the house. That got old quick. Also I missed landscape orientation lock and slide over.
(Oh and switching out the SIM card is not really a solution for multiple reasons, the most pertinent one being that my carrier doesn’t use them.)
Call it an iPad mini mini or an iPod touch max max, but unfortunately no such Apple device exists to fill my (and maybe OP’s) little niche use, and probably won’t in any foreseeable future. ☹️