So for the Shortcut feature I was on about yesterday - this is what I set up before - was posted by someone on the Forum:
Hopefully that explains how you set it up - you do need to use IFTTT, which I forgot about, but it still useful.
The end result if you follow this exactly will be a button you can put on your home screen that will move an inputted amount when pressed.
With a tiny bit of tweaking you could make it default to a specific value at each press.
The guide says AMEX but it is effectively a pot-moving tool that works outside of the app.