> There is approx zero chance that you can get a homeless person to do labor for 20 minutes, let alone the 2-5 hours this would actually take.

And yet homeless people do labor. In fact routine living often requires much, much, much more labor when homeless, than when housed.

They even have jobs. I worked when I was homeless (but was fired when they found out). That was long ago. Since then it's more difficult to find work; job portals erased most job opportunities. Of the few folks willing to give you work, you have a segment who take advantage and act in bad faith.