Hi James,
Sure, I will help you. If you want to follow the two methods I suggested before, then you need to use third-party solutions. I will explain in step by step manner.
Step 1: To convert AOL mail to PST file format, try to use AOL backup Tool developed by the team SysTools. You can get the perfect solution in a cheap cost from their site. I think it is one of the good and better solution available inline. With this utility you can also convert all the mialbox items to PST file format.
Step 2: To easily import these PST files to Gmail, you can take the help from Outlook to G Suite Migrator Tool.
Hope this will help you to reach the solution
Kind Regards
Barry Scholfiled