At a guess…
- Meeting the FSDO will only result in a 61.75 certificate.
- From my experience, a type rating was not available at Commercial level (the 142 school needs to have specific authorisation, and it’s normally just at ATP LEVEL)
- You should be able to complete the ATP-CTP, then Knowledge Test, but ATP Checkride in Sim only has certain restrictions. Based on your post, there is not enough information, but FSDO should be able to help direct you.
You could always try for a license validation? (61.77 Special Authorisation) if that applies to you.
Good luck.