I’ll be honest, I’m very confused about what you mean when you say that Google Wallet isn’t a thing. I pay with my Android phone everywhere, so ubiquitously that I’ve frequently left the house with just my phone and keys.
Do you mean America, where contactless payment is far less frequently accepted, or the concept of clicking on a “Pay with Google Wallet” style prompt on a website?
I have the same problem, and honestly I can just about force the thin side of the floss between my teeth but it’ll get stuck sometimes (as the tight part is the top of the tooth), which is just not great.
The brushes, which I was excited for and bought the smallest size of, will only fit under the problem area - and are uncomfy.
So I use them to clean electronics 😅