I'm wanting A few of my Silkie girls to hatch out Ameraucana eggs late Feb, March-ish. Just a few dozen

However, here's my dilemma. Timing. It was mentioned to me that if I wanted the ladies to go broody then I could put a bunch of eggs in their nesting box and watch the magic happen, then swap those bait eggs out for Ameraucana eggs. Will this work? I need to 'order' eggs for a date range, but don't want to waste eggs if they won't sit on them.
Another question: how many Ameraucana size eggs can one Silkie take on?
Thoughts, experience and suggestions always welcome
