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True - I've been in metric/blue and white propeller land for long enough - I'd agree, changing toolsets is a royal pain in the ass
I'd suggest a Transalp - but it fairly underpowered for its weight - 55hp or so in a 450lb frame.
Been trying to ponder this one out - there dont seem too many beasts that fit into what you're trying to find I'm afraid
Could always go the ducati route http://www.terramostro.com/
In all seriousness though - keep us posted. If you can find something in this niche I'd love to hear about it - up to this point KTM's been the most likley candidate really.
Sling a post up in Beasts over on ADV, see what comes out of the woodwork.. never know!