I could easily take offense at that, but actually I think you're right!
I've been running down a list of American filmmakers in my head, and I can't think of any working today (established or up-and-coming) who would be better qualified to tell Bartley's story than either Shane or Paddy. :-\
"Maybe I'll always be the one and only girl for me"
~ Kirsty MacColl, "The One & Only" (1991)
Keep my seat warm. I'm there if there's a screening. Would you stretch to a Nottingham screening. Or you could do a Micheal Jackson style synchronised multi release with the film starting at precisely the same time in a few select cinemas around the country and a live q&A link up to the Sheffield one via skatalite (Like National Lottery Euro millions).