I'd pay decent money for a 4 inch phone as well. I've been in the Apple ecosystem for years but decided to search for a current Android phone that's around that size, but couldn't find anything decent.
An Apple watch with LTE would likely let you make and take phone calls, optionally with airpods worn.
Or any other smartwatch with a SIM, there are plenty of options.
Sure, but why settle for anything but the best? :)
That's actually not a bad suggestion! I'd miss being able to snap the occasional photo, but I could always carry my old iPhone if I anticipate the need for that.