So the drop off went well, rave reviews! I ended up scrapping the foil bag idea and did a simple wrap with square foil pieces. The meat was heated, the sammies assembled, then put back into warmer until time to box & go. I tossed the porky lightly with my vinegar sauce, and I opted for kaiser buns. The feedback was that they were not soggy at all
and they want me back for the next one.
Cheers & thanks for the tips!