Rose combed brown leghorn was a great suggestion.
It looks like Ancona are also white layers accepted in rose comb variety.. probably harder to find than leghorn.
Polish DO come in standard size also, not just the bantam size.. Crested birds can sometimes be feather pecked in non crested flocks. Despite it never having been and issue for me, I do know of other flocks that face it. Rosecomb is a bantam breed that lays white eggs.. if bantams are a consideration with their small egg size.
I've also never had issues keeping bantams in a large fowl flocks without an LF rooster. But I do recognize that every flock will have it's own dynamics.. One thing for sure.. don't add just a single one crested or bantam.. add several and help their odds of fitting in. My family hated the bantam eggs for using in recipes, though I didn't mind.
Straight comb birds don't all get frost bite, they can be pretty good at tucking their combs into feathers. Keeping moisture down with proper ventilation (not extra insulation) can go a long way towards preventing frost bite.
All comb types are dominant to straight.. straight comb is lack of another gene.. generally speaking.
Getting white eggs, may be more complicated.. but should be doable within a few generations. Breeding projects with a purpose are good fun.. the right information can save you tons of time.
Best wishes!
