Leave your bank card at home, top up Monzo, move money in/out of pots.
If you lost your card, and if the person who found it isn’t honest and if you’re at the bottom of your contactless spend, they can take some money.
Just seems like you’re trying hard to mitigate a risk that isn’t really there. You’re more likely to have your card cloned from using it online/data breach or a dodgy cash point.