is it possible to raise silkies indoors completely?

You could try to trade the roosters for a hen. I do not have any experience with raising silkies in the house, but I belive I have read that some people do keep them in the house. If you decide to, you will need to get rid of any cookware that is nonstick or teflon. It does something to their lungs, at least with parakeets.

 

You could, but it would get old fast. Chickens aren't exactly the cleanest of animals! Silkies are particularly hard to sex so I would wait until you are sure they are roosters, then rehome them. If you can't have them, they are pretty hard to hide once they start crowing. People here have had a lot of success selling roosters on Craigslist. Or as jlovelady said, you could try trading them, but it will probably take longer to find somebody to trade with than if you just sold them.

 

I bought two silkies in Oct. hoping at least one would be a hen, with in 3 weeks, I found out one was a roo. Three weeks ago, I found out the other was also a roo,and he is not a friendly one either. He is posted on Craig's List, and also at my local feed store.
My silkies were inside for the 30 day quarantine, before I moved them outside. They are in a separate coop & run, apart from my standard hens. It was a long 30 days, I was ready to move them out, and I was cleaning them every other day, and there was dust & wood shaving every where.

 

Chickens create so much dust...it really isn't healthy to breathe. Some do keep house chickens and love it apparently but I prefer to keep them outside.

 

You can keep them in a separate room or garage probably if you want them inside and are worried about dust. they also make poultry diapers. I've heard you can have the rosters de-crowed but its probably expensive.