It's up to you. I personally prefer having moms raising the ducklings, to save on all the cleaning, but I worry more too about something happening to them!
I ignore behaviour like that and just stick my hand in anyways! :lau My chocolate quacker is meaner than my scovies.
Since (from my understanding) Fawn is a mix of Blue and Chocolate, a male bred to a non-chocolate female should give you all chocolate females.
As for the Magpie, yes, that's poorly marked.