Not to be a smarta** or ask a stupid question or anything, but how would one go about adding multi-time in a situation like this? Seems like you can't get a job with make and model time, but how do you get the make and model time without a job

I know a guy who got a job as a BE90 PIC flying parachute jumpers in Minnesota with around 1100/150, but this seems the exception more than the norm.
I'd like to work my way into a King Air job in the next 2-3 years. I have (a little) BE20 experience and would like get a right-seat job, but I don't want to log shady time. Can you log SIC in an airplane such as a BE20 if the 135 certificate the plane is on requires an SIC?
Didn't mean to hijack the thread, just look for advice for people higher up the food chain that have "been there, done that". Thanks for the advice.