I, personally, don't think introducing 1 Silkie to 27 standard birds is a good idea. That's why I always encourage folks to learn about the breeds they're thinking of getting. Did you know most Silkies have a soft spot on their head, like a baby, under that crest? A well placed peck can cause them all sorts of problems (head tucking, somersaults, twitches, walking in circles, even death). If you'd had more than one it may have at least giving the opportunity to spread the pecking around a bit.
I'm not saying the introduction can't be done, but the only thing I can recommend would be to supervise VERY carefully and hope for the best.
Oh, and a standard rooster and a bantam hen can be a recipe for disaster depending on the guys personality. Even if he's a gentleman, he can still hurt her during breeding simply bc of the size difference. Good luck, I hope you figure it out...
Nikki