Ideally, I’d like to enable it temporarily without reducing wallet security.
You can keep the option checked by default and uncheck it when you need to take your screenshots. When you are done, go back into settings and put a check to prevent screenshots.
But even if you enable the option to take screenshots, your wallet security can only be impacted if you take screenshots of your seed or private keys. There is no reason to do that, of course. In all other cases it's your privacy that can be affected if malicious eyes find out how much bitcoin you have and in which addresses you keep them.