That sounds like something a Mood could handle for you:
Trigger On: When an effect is lost
Check For: Flapper Dancin'
Command: use 1 flapper fly
Currently, VMF does not track what items you gain while adventuring.
It would be relatively cheap (computationally) to save inventory at the start and compare at the end to see what items has been gained - just as it does for Meat.
Doing it after each turn would be the same calculation - just multiplied by the number of turns.
There's another farming script which apparently counts gained items as part of your profits. That's fair, although one wonders how they are valued. (5th cheapest) mall price? I actually find that pretty dubious, since, unless the item is priced at mall minimum, the current mall price is not "what the item will sell for". It is "what the item is not currently selling for" - since if it's in the mall, it has not been sold.
This script COULD track items gained across the whole run and do some sort of analysis/valuation at the end, but tracking items gained after each adventure and doing ... something ... with that info seems out of scope.