It is all about how they were raised. I'm going to attempt your plan. I usually do give all silkie chicks to a broody. Usually.. Not always. The ones that are raised by a broody who is not a silkie do MUCH better. Like my silkies raised by a cochin. The cochin hen they are being raised by still has them at 12 weeks, but she is a good forager (for a cochin!) Though I seriously want my broody Marge to go broody again. She was the best. I just love heritage breed broodies.Draft horses eat about the same as a regular horse but still maintain their big build. That's me....big, solid, easy on fuel.![]()
Maybe that's something you could breed for in your Silkies? Get them out on free range quicker with a good, resilient mama and then cull for those who are quick, forage well and have survival instincts. It's probably never been done before and you could sell them like hotcakes if you developed a strain that could do that. They have the very same body structures of any other chicken...no reason why they are slow to move and don't forage well.
Keep the fluff trimmed out of their eyes and see what you can do with them. You could market them to a whole new crowd of people who want one or two but can't free range them because they are hawk bait.![]()
Welcome to BEEs slammin' style of developing a free range chicken....put them out there and kill all that don't do it well. You may only have one left, but that's still breeding stock.![]()
Take your best forager who has gone broody, and give her as many silkies as possible. Train them good!
Note that this silkie was a co-parent with the Barred Rock. It forced her to get out and forage with her kids (who preferred the BR mother!) Don't tell the silkie that

I do think it's the vision that makes them poor foragers.