Adding some pets to a laying flock can be fun, but be aware that your flock may not take kindly to smaller bantams. Some large fowl flocks harass smaller bantams, and some of the very small bantams can be quite vulnerable to larger birds.
Also, smaller bantams are more vulnerable to hawks. I have learned that my bantams are simply hawk bait where I live (while my larger fowl go mainly untouched).
Therefore, you may need to keep your smaller birds in a separate area altogether.
However, if they are pets, that doesn't have to be an issue and can even encourage the more pet like behavior rather than the rough and tumble ways of keeping up with a large flock.
I've not had the breeds you mention, but I do have Silkies and bantam Cochins. Either of those can be quite personable and gentle. Bantam Cochins (or Pekins) are especially docile and sweet. I do recommend that if you go with the foot feathered variety that you keep them on bark chips or the like. They become mud balls waiting for bumble foot otherwise.
Hopefully some experienced owners with the particular bantams you mention will pipe in.
Good luck on your pet hunt

LofMc