There's an elephant in the room I'd like to point out. It may not be the case with you, but most people will admit later on... when they say they want "crew time"..... what they're really saying is they don't want to learn hard IFR single pilot via the "sink or swim method."
I get it, we all do. On the other hand, you might be surprised how many people gain the confidence to fly single pilot IFR after a couple hundred hours of mentoring. Might be that they see that they are every bit as capable as the person in the left seat, and the fear of the unknown dissipates.
If you get to ATP mins in a freighter, in this current environment, you will have your choice of regionals regardless of whether your time is single pilot or crew time. Also, bear in mind the time as SIC in the Accelerated Captain Program, while loggable does not count toward your ATP.