I've totally popped in another dish while my bird was roasting before—it didn't affect things too much. The only thing I'd worry about with the crockpot is that you'd miss out on the top crispy bits that people fight over! Consider that stuffing can also be baked before the bird, and then put back in a low oven to re-warm while the bird rests.

I've never tried but I'm sure it's possible since stuffing can be baked on it's own! Here's a good recipe: https://food52.com/recipes...

Use this guide to help you find the cook time: https://food52.com/blog...

I love my slow cookers (yes..plural..I have 3). I use them all the time for everything from rice to beans to the usual. I have not cooked stuffing in them, but only because I make stuffing muffins. I never actually cook it in the turkey. I love the crunchy outside. My mom has a huge commercial convection oven, so it isn't phased by other dishes being added with the turkey. Here is a good tutorial by The Kitchn. They are trustworthy. You can use your recipe, but follow their method.
http://www.thekitchn.com...

http://www.seriouseats...