Now THAT is doable
You'll probably have to pick and keep just one roo, though. 3 will be too many and from my experience with silkies, the roos are like chihuahuas lol; they think they're scarier if they act like they're tough ha-ha. My silkie roo was really rough on my big hens and avoided his girls. He was weird, though, so don't let his issues ruin your idea
It would be WAY easier to incorporate chicks of bigger breeds, though, that way the silkies have the upper hand to begin with. There won't be near as many pecking order issues that way, and when the hens are mature, they will know the silkies, not think they're intruders or snacks. And silkies probably won't harass chicks near as much as an adult large breed would harass silkies.
Adults might fare fine too if numbers are more even like that

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Absolutely amazing advice! Thank you SO much! Now the trick is finding them! Lol Chickens are few and far between here for some reason. I'm having to drive 2 hours one way to get 2 birds.
And 2 hours in another direction to get 2 more.
Not to mention I haven't gotten a single egg yet, Freeloaders. Lol