Coelacanthus

Maybe you can do both: physical USIM card, but with eSIM functions. So you can move your profile from one phone to another just by plug out and plug in, and install many profiles on one phone and switch between them. There are some products can do it, such as eSIM.me, esim.5ber.com or https://github.com/estkme-group .

Yes unless both my phone and headphone support LE Audio.

deleted by creator

No. Just because I’m not always able to use my own device. If I use other layout and have to use other’s devices (e.g. library computer), I will be confused with normal QWERTY layout.