There is no more formidable foe in the chicken world than a broody hen protecting her chicks.
Noe of the other hens will mess with them and by the time the broodies when the chicks, they will be accepted as members of the flock.
I wanted to add that in the last 2 or 3 winters I've had hens and...
The hens will do it all. Hens have been raising chicks on their own in all kinds of weather for millions of years - that was before heat lamps.
I've had hens hatch and brood chicks down as low as -5C.
When it got colder than that I did hang a heat lamp above the food and water so when the...
I would just mark the fertile eggs under the hens in case they are the same color as those your birds are laying so you can remove volunteers.
Other than that, the hens do all the work.
Electric poultry netting is quite portable. I'm sure someone there sells it. Most feed stores here do.
Something like this.
https://www.premier1supplies.com/list.php?mode=list&cat_id=118&species_id%5B%5D=6
Aphis has all the information you need on how to import and countries of origin allowed.
https://www.aphis.usda.gov/aphis/ourfocus/animalhealth/animal-and-animal-product-import-information
It is a very lengthy and expensive process. My best advice is to make several trips there. Travel the...