Way to think it through David!!! Good job! As to fourth step, you can work that just fine without your sponsor's help. The big book lays it out pretty well. You can also access worksheets for it on the internet. SR also has a 12 step support forum where you can post questions and read about working the individual steps.
The bottom line is that the most important person responsible for you successfully working the fourth step...is you! You are the only person who will know if you were completely honest and thorough. Maybe your higher power is telling you that this a prime opportunity for you to step up to the plate and assume full responsibility and ownership of your actions. You can do this!