Rafael If I longpress my power button, I can see all cards that I've added to Google Pay (Android 11). On Android 12 and 13, I believe you can add a Google Wallet shortcut on your lockscreen.
So if I want to change the account I'm paying from, I only have to longpress my power button and change card with one swipe. Pretty easy!
(By the way, you're now posting in the community where you'll find other bunq users just like you and me, not bunq employees)