Nice looking bbq Dom. Sorry to hear about the sauce.
FWIW - I sometimes will whip up a similar finishing sauce as what you described, usually some sort of berry fruit preserve and **** sauce, then reduce it on the stove. With additional lime at the end to thin it back out a bit. If I want more of a sour kick, I'll add some powdered citric acid. It seems to hold up well. I do use sweet chili sauce for some things, typically just as an uncooked dipping sauce though.
