seat fillers

[U-I pilot]

Are there any 135 operators or other corporate type operations that need a body to fill the second seat up front? I know that planes requiring two pilots can substitute Autopilot usually but if they dont, this could be a good way for low-time (only piston experienced) pilots to get a feel for a more complex aircraft and possibly build time.
Since times are so tough now I would just like to see what all options out there are to build time when I come out if CFI jobs are drying up!

Thanks- Bryan