Tested and it worked. UX could be improved by having a lightning metatag so that Alby browser extension could pick up on this without having to use the clipboard (many clickety-clicks could be avoided that way). Also, would be nice if content loaded automatically after the payment is received, no need to keep the QR code on the screen after that.

As a side note, I'm not at all convinced that QR codes are the best way to go on websites. Better way is to just have direct payment buttons like Primal (for example) has for zapping. One click and done - or 1-2 clicks more if the payment needs to be accepted in the wallet. QR codes are a good fallback if the browser doesn't have payment support extensions.