For your first question i'd suggest to just make a preset by yourself. It's not a big deal.
For working with prores on windows, you'll find that you can import and edit prores footage
but you wont be able to export it. So stick to dnxhd for hd or dnxhr for higher resolutions. It's
as good as prores. If you still want to export in prores there are several workarounds. Just google it.
But the more people start using dnxhd&dnxhr the more people are gonna accept it as delivery format.