What I'll do instead (and, honestly, this is what I already mostly do anyhow so it's not really a sacrifice) is physically go to the bank branch to conduct my business.
At my bank, they will then send you to the online banking, or the phone (with it's 20 min plus waits).
The Mobile app is required to use the debit card anywhere but card present, because 2fa. The Mobile app is required to do interesting things on the website, because of their 2fa. The iPad can't use their website (because reasons, they think it's mobile) and can't use the mobile app because it's not the configured phone with the account.
Credit cards really aren't a thing in this country, and if they are, they will generally have a phone based mobile app for 2fa/strong auth.
If things were like that where I live, then I'd have to have a different response, obviously. I'm sorry that your options are so limited.
I'm not sure what my response would be, but I'd probably lean toward having a separate device that's acceptable to the bank and that I use only for banking purposes. But I don't know.
I don't know about your country but here the only people who physically go to the bank are 80+ grannies and granddads who think they're too old to learn this bloody computer stuff, and who are also willing to pay exorbitant 10-30 monetary units for each bill paid by a physical person in the physical bank, and to do even that they must accept that it's ok if you have to book an appointment at the bank's counter in advance.
It's nothing like that here in my part of the US, fortunately. I am becoming increasingly aware at how lucky I am about this in these comments, though! As I said in another comment, if I had these obstacles, it would absolutely alter my response to this.
I don't pay my bills at a bank or bank website regardless, there is no surcharge for going to a bank's physical location, and I don't have to make an appointment.
And people who go to branches aren't exclusively elderly and/or technophobes -- but even if they were, what does that matter?
Having visited my local one last summer, and after waiting in line for a good twenty minutes, I wish you luck. Thankfully I can do 99% of what I need through my app/online.
