Linking Another Everyday Rewards Card to the Same Qantas FF Account

There seems to be no information online about this, which is surprising because I know some people have like 15 Everyday Rewards accounts.

I have a few Everyday Rewards cards with points sitting there doing nothing on two of them, and I want to book a flight. One Everyday Rewards card was previously connected to my Qantas FF.

Will anything happen (e.g., accounts banned) if I unlink the Everyday Rewards card which is connected to Qantas and link a different card to move the points to the Qantas FF account? Will the points actually go across or will I get some weird error about having multiple Everyday Rewards accounts?

Cheers!