No, the membership ends when you cancel the sponsoring credit card.
What does prioritypass.com show as the guest policy of the lounges you plan to use?
I don't see anything about guest policies. Maybe it would show more details if I were an active member and logged in?
https://www.prioritypass.com/en/Loun...R7-Art--Lounge
If guests are not allowed, then it won't be of value to me anyway since my wife isn't an AU. If guests are allowed, then we're traveling on both flights with a couple who also have CSR with an AU, so we'd be able to get in with them.