Sorry I can't directly say for that breed.
But one idea you could do also is asking your friends and family members how many of them want to take advantage of all this economic damage to become more self sufficient and get some of the chicks you are hatching also?
You could do this to spread good will, or even ask for a few donations in return for chicks to help fund the project, or even try a gofundme setup.
I think a lot more people are starting to get serious about wanting to do what you are doing and you could use this to your advantage to create a lot of positivity in your friends and family nearby.
I was recently surprised by how many of my neighbors love ducks and chickens. Today I found out my left side neighbor had ducks a few years ago, and I didn't know that. And last week, the other neighbor on my other side had them. And the back fence neighbor used to have them. And the other one next to them was saying something about them...and that's ALL my immediate same side street neighbors! I was surprised how many of them are interested in 'self sufficiency' right now, and that's not even counting the cute pets factor.
With more limited incomes people are also worried about financial slavery and unemployment and not being able to buy food.
I wish you luck with your project and sorry I don't have more specific information for that breed. You probably could try and average for breeds across the board while you are using the time to get more specific info and then go up or down with an adjustment within a day or so. Or if you get some dud eggs use any extras to compensate for those ahead of time also.
