Well,
I know this Benchrest forum is pretty popular ... among benchresters, but I suspect more frequesnt discussion of your activities on a Forum with more airgun traffic could draw in some airgun shooters that are, at present, relatively unfamilar with your game. The 54 Airgun Forum has tons and tons of traffic, and though most are not serious shooters like youall, there might be some budding benchresters in the mix.
Also, in my own personal experience, it seems any places where some airgun BR shooting is taking place are fairly limited with respect to how many shooters can be accomodated .... for instance, my range is on my own private property, and I only have five benches at present, for a variatey of reasons. Another Range whose matches are posted here has around eight light folding benches, and anther that HAS, on occasion, posted here has (I beleive, six) benches. But there ARE a few larger public ranges with more accomodations, if only sufficent publicity and iterest were drummed up to be able to "book them" for an event.
See, I think larger regional events might be put on, but its the chicken and the hen thing! I suspect if there were a "West versus East USA Challenge" matches, say, posted well in advance with rules posted and a come one come all invite to see who has the most accurate airguns around, well then perhaps this sort of event could be used to generate qualifiers for a true World team, I dunno, just brainstorming?
I bet a big match in say, Reno might attract some entries, if publicised, or maybe not?