"Huh. I do not know of orders having been employed in that fashion, unless you count places that take those who default on their debt and send them to the Worldwound and I don't think I'd really count that. ...historically most religious orders owned land, and had income from that land, as a nobleman does, but instead of passing the land down to their sons as a nobleman does it would be passed down within the order. There were orders for the care of orphans, and for the care of the blind, lame, or mad. There were orders that were perhaps best thought of as just a household, with the usual range of work except that the members were whoever took vows. Perhaps when we visit Lastwall you can talk to some people in the orders there.
My concern about using non-martial orders as a - route for the desperate to escape - is that I think that they work because of the sincere devotion of the participants, their choice to make the service of a god the central matter of their life, and if they took too many people for other reasons it'd change their character and perhaps lose most of what makes them good. Of course there are always some people in an order who did not want it and were forced to it by their families, but - ordinarily I think it is not the majority, and if it's gradual there is the opportunity to shape them to their life over time.
Martial orders might work better for this, because they can make more use of men with no particular desire to be there, but for that there's just the Reclamation, which is neither trying to grow its numbers nor suited to power over Chelish people, and the Hellknights, who - I'm not sure how thoroughly they've reformed. I suppose you could also say that joining the army's a route out of any indenture, though I'd want to ask the Archduke d'Sirmium what he thought of that."