I cannot see it doing unsealed airstrips at all.
Back in the 80s I operated C550s for 10 years into gravel, grass, dirt all over Qld and NSW and at an AFM reduced weight of 5700kg, We watched our fuel and pax loads and did a lot of re-calculating in flight.
Had a lot of problems with "operational control" and getting a signature on the Flight Plan at some briefing offices was difficult.
"
what? you want to take a jet outside controlled airspace and into a grass strip, you can't do that" was a not an uncommon comment when flight planning.
Even landing at Archerfield for inspections was a problem initially.
I can see it being used
But having operated the C550, B200 and B350, I would have thought that the King Airs would still be more suitable.