Change group profile to user profile

Is it possible to change a group profile back to a normal (stand alone) user profile after deleting the users from that group?

Yes, but befor that you might also want to look at what objects are secured by the group profile. A group profile is just a user profile that is used for grouping access to objects. If you are going to use the group profile as an individual profile then you need to set the securities and object access for that user.

A group profile is only considered a 'group' if it in included as a group or supplemental profile within another profile. Removing the profile from other individual profiles will remove it from the 'group' category.