Im curious about your suggestion. I adjusted them when I rebuilt them a week or so ago. It’s a mechanical adjustment based on pad to drum separation. Are you thinking that they are too loose causing excessive travel?
If you put in new pads and shoes, you won't get pedal till the 4 front pads are in full contact with the rotor, so that can take a bunch pumping, and if the rear shoes are out of adjustment, it can take a buncha pedal movement/pumps to get un-adjusted shoes out to contact the drums, so no pedal till then.
Lotta folks complain about low/no pedal, and rear brake adjustment is commonly the issue.
Bleeding - If you set the emergency on, that'll move the shoes out to the drum and keep them there, and the first coupla pumps will move the wheel cyl pushrods out to the shoes and stay there cuz the springs can't return them, then you will get pedal.
(If the wheel cylinder pushrod missed it's place in the shoe, that will cause no pedal.)