Well, since you're flying an aircraft that is certified as a Single-pilot, if you are not flying as PIC then you can not log that time, right seat in a single-pilot airplane gives you good experience, but it is not loggable time.
"I know I can't log it as SIC but heard through the grapevine yesterday that either Alpine air or Ameriflight challenge the FAA and got a ruling in their favor that you can log the the total time of the flight towards your total time, but only that portion which you flew the plane as PIC."
That statement doesn't make sense, because if you are flying PIC then of course you can log it. The problem is is that if you call 10 different FSDOs, you'll probably get 10 different answers.
Good Luck!
TG