Joan,
I made the sauce Key West BBQ sauce yesterday in 1/2 size like ya'll did. It still made a lot of sauce. I made some substitutions on some of the juices but It was pretty close to your original recipe. If I do it again, I'll plan a little better and get as many fresh ingredients as I can. The work is not necessarily in all the ingredients but the juicing requires a little more time than a normal sauce.
This sauce had a lot of "twang" (yes....real word) to it considering it didn't have any vinegar.....which we like. I was able to do fresh onion juice, lemon and lime but store bought containers on the grapefruit, ,mango, orange and pineapple (used orange-pineapple mixed juice for this). I could not find passion fruit in anything other than a 1 gallon container so it got skipped this time. Also, subbed molasses for cane syrup. So.....we were kinda close.
The one thing I screwed up on is I over-shot the cornstarch amount and it got thick like a BBQ brownie mix. I watered it back down a little and it was fine. We decided to do wings and use the sauce to hit them at the end.
Startup - KBB Pro with chunk of pecan

Below is about 45 mins in. Cooking around 375 at this point and wings have been flipped once.

Below wings have been sauced one time. My sauce was extra-thick but it glazed up well. I didn't get a final shot OFF the grill but did add a little more sauce.

Overall, everyone liked the sauce. It seemed to have more spice to it when tasted by itself but was good on the wings. We'll be using the leftover on something else as well.