Dennis-Blue-Panda-4203258022 This used to work if you went from Premium to Free and then back later. But Free no longer exists.
I suspect it is possible, but this is nowhere officially explained as a possibility as far as I know (the possibility with Free was explained).
In this topic: https://together.bunq.com/d/13578-additional-questions-about-bunq-travel-card , JohnDo has posted a nice overview of the differences between the subscription types and how you can switch.
But being able to reactivate old frozen payment cards is not mentioned there.
In this topic: https://together.bunq.com/d/13722-travel-card-in-combinatie-met-joint , Ewout-Blue-Kiwi writes a similar workaround to go from Joint to Premium first to get extra payment cards. order and then back to Joint so that he can activate another type of payment card.