satsuma
You comment: "Something, anything that took the form of backing up the pilot's decision making with regard to the weather or aircraft serviceability would be sufficient".
The problem is how to focus effort where it is really required and would be effective. The fact is the vast majority of (corporate) flights are very straightforward and 30 seconds looking at the TAFs and METARs is all that is necessary to know that weather is no problem - and I assume everyone does that at least at the start of a day and often the day before a flight. Any requirement to have to box tick and document what the weather actually was for example would be laborious, tedious and superfluous in these situations. And at the private sites helicopters often operate from there can never be any proof of what the weather actually was anyway, so subjective judgement is required, with contingencies if it proves worse than anticipated.
And surely aircraft serviceability is something that is verified (as far as a pilot reasonably can) by checking the tech log to see it is within maintenance schedules, checking for defects and doing and signing for a Check A. What more could one be sensibly doing?