Well, it's not a deal breaker I think, this sort of thing happens maybe once per match, or maybe not.
You could have shot it prone weak hand also, which would have been basically just as good, but we did it like this since we have the gadgets. I've shot IPSC rifle successfully since 2010 before buying all these different bipods this last year because sometimes it comes in handy.
Raine doesn't use a side mounted RD either like a lot of other people, and he still won, so I'm pretty sure there are US guys that would do good. Daniel Horner and a few others placed well in the 2009 ERC. If you can shoot a rifle and are familiar with comstock scoring there's no problem.
Another problem with attracting US shooters might be the prize money....there are none, not even on big matches, traveling to matches is for the most part 100% expenses, and nothing back.