Patrick Olwell, who is located in Virginia, makes exceedingly fine bamboo flutes in various keys. I acquired an 'F' from him that is just fine, and I do not have overly large hands by any stretch. I regret that I do not have his number readily at hand, but if you are interested, I am sure I can get it. I do not have great familiarity with any of the other fine flute makers out there, but a lot of folks who play Irish music like his instruments. For an opening book, I would recommend The Clarke Tin Whistle: A Handbook by Bill Ochs, though to play along, a D whistle would be needed. (If the LARP is circa 1850, you can get a Clarke D or C whistle--they hark back to 1843.)

Good Luck

Tom D.