I have to do manual sign ins, because my phone is too old and not connected to the internet.
I refuse to allow the GOVT to FORCE me to buy a smart phone.
Yeah, a manual sign-in, in leiu of a QR code check-in, will suffice. Or, someone can check you in as their 'guest' as they check-in. I do this for my 98yo mum - smart 'phones and QR codes are a bit much for her.
But you will need to have your vaccination certificate, if that's not on a smart 'phone, a printed hard copy will suffice. Although (thinking outside of the box), a copy on a laptop would be okay (if you have a laptop).
Re. a smart 'phone, these days I would feel naked without one. In some respects, I congratulate you for being so independent. But (there usually is a 'but', although this time not a big hairy butt), I think you will find that in the future, there will be more and more things smart 'phone and technology dependent. I would encourage you to reconsider your current position.
Yeah, they're not cheap if your buying new or a late model, but many used ones can be picked-up very cheap, or sometimes for SFA. When I busted mine on a trip, I got a secondhand one off Facebook Market Place for $50, swapped the SIM until I got my old 'phone repaired. You could have that (for a coupla jars of jam), except that it's now with a "friend" who busted theirs (I don't think I'll ever see either of them again).
You never know, someone on here may have an old 'phone sitting in a drawer looking for a new home.