Hi there, @thephiljohnson.
Thanks for reaching out to us here in the Community. I'm here to help make sure that you'll get the help that you need about deleting an Accountant account.
Since you use the same login when signing up to QuickBooks Online Accountant (QBOA), It'll be best to contact our Phone Support team. They have the tools that can separate your QBO account from your QBOA account.
To reach them, you may visit this link and proceed to connect with a QuickBooks Expert: Get help with QuickBooks Online.
After contacting them, I'm confident that you can get rid of the QBOA account while keeping your QBO login.
Please let me know how it goes by leaving a comment below. I'll be here if you have any follow-up questions. Wishing you and your organization continued success!