In the past, straight 135 mins would get you into the Chieftain. You'd need some higher time or turbine time or something to go into the 99.
Right now, I doubt you could get into the 99 at all. You could REQUEST a 99 out station base, but I doubt there are any going to external applicants, though KLB would have to provide the real time data on that.
Go fly the Chieftain for a while, it's a fun airplane!