I’ve seen dedicated hardware devices which scan a QR-like code and show this in a little screen of their own. The bank provides them and does not require any app.
I am interested too, my fallback bank trapped me (or my courage to resist), the fallback of fallback would be crypto but i am not sure i want to depend on this too...
Meanwhile, the last hope is that people will use more cash (if the digital world is too hostile, oh wait it is!)
I only know of a single bank using this.