[Membership 2 Pro] Membership ID Numbers Incorrect


We have had members on our old website for quite some time and have recently built a new website and used Membership 2 Pro to manage the members.

There is an issue though, as our members have long standing ID numbers (they are on their membership cards etc).

It seems we are unable to edit the member numbers as they are WordPress ID numbers? I'm wondering if there is a workaround here so we can display the CORRECT membership numbers?

Any help/advice would be greatly appreciated.