Only the cellular iPads have the eSIM. The standard WiFi ones do not. Since iOS covers both of these devices, older models, and folks who choose not to have a carrier despite having the ability to do so, I don’t believe this would be a partial solution at best.
Any recent iPhone/iPad will support eSIM. It would work just fine for them.
An eSIM still requires an account with a carrier, which is optional when you setup a new phone.
Yes, but you can just contact an EU company that provides eSIMs and get one.
Only the cellular iPads have the eSIM. The standard WiFi ones do not. Since iOS covers both of these devices, older models, and folks who choose not to have a carrier despite having the ability to do so, I don’t believe this would be a partial solution at best.