Wow! What a great story. I am picturing your benefactor as "the most interesting man in the world" from the beer commercials.
The BeLeaf seems to be quite hard to find in the US, and the one online item I saw was about $300 US dollars. I do see a product called Aria that contains flonicamid (not to be sold in NY State, but I see flo- has been cleared for use in Florida citrus crops, so that may be a lead.) The Aria's still $166 and way out of my league for the small number of plants I'll be dealing with.
Exalt doesn't seem to be readily available here either. I found a DOW document and it says it releases under three brands: Trade Names
Delegate® WG insecticide
Radiant® SC insecticide
Exalt™ SC insecticide
Radiant is available at a thousand dollars a gallon. Mmmkay. Something called XXpire is in the $300 range. Priced and packaged so only Big Ag can afford it.
Maybe I can find someone who will sample me a thimble-ful...
Thank you for your great documentation!