Hi @Roger Roger ,
I don't think we can do this,if you delete the group-connected teams site, it will also delete the group and all its resources, including the Outlook mailbox and calendar, and any Teams channels.
More information for your reference:
If an Answer is helpful, please click "Accept Answer" and upvote it.
Note: Please follow the steps in our documentation to enable e-mail notifications if you want to receive the related email notification for this thread.