Thanks for taking the time to weigh in on this, Gentlemen. You've been a big help, I assure you. To that end, I've asked my knot maker to quote on 28mm 2-band Fans and Bulbs--and to throw in a quote for 24mm Fans as well. These knots are pricey; so I need to be careful with capital outlays. But these seem like a good bet. It might take 4 - 6 weeks to get them, but I'll let everyone know as soon as they come in.
As far as synthetics go, I had some demand for them when Muhle/EJ came out with their STF, but then several ended up collecting dust until this past spring, when one fellow bought the remaining stock. If anyone really wants one, I can always special order a knot.