What about this:
If you had to make a new breed, what features would it have? What would you name it? Purpose? Egg or meat?
Purpose: Eggs and meat in a colder climate with as much margin/flexibility of management as possible.... meaning as practically as possible.
Features:
Eggs: large, steady but not high production
Meat: moderately meatiness
Colder climate: moderately large body size, comb on the small side (type doesn't matter)
Reproduction: occasionally broody, attentive mothering, attentive roosters, protective (not excessively protective) roosters, tight feathers (higher fertility)
Free ranging: on the flighty side, normal feathering (not frizzle, extra, missing, long, ect), dark feathers (black, probably, but maybe some other colors), legs any color except yellow
Not free ranging: on the uncontentious side within the flock
and just personal preference: dark eyes
Black Java is close but doesn't have large eggs and may not be flighty enough. I don't know about mothering or rooster characteristics or contention within the flock in Black Javas.