Well you're in luck! This works with all S17 and T17 models. (for the unlock and signature check removal)
Ahh I see. Do you want to half it now or half it once the halving comes when you will really need that extra efficiency?
The + is still a work in progress for the 17 series. For the non + models should have it posted by the end of the week or start of next week.
For the S9 firmware in rocketship thread will work on S9 and S9i. You can use BTC Tool to mass flash them. But I would first flash one. Lower the settings and get around 70w/th or less if you can. Then you can flash all the others and there is a setting to scan for other S9's and mass deploy the settings you fine-tuned to the rest of them. For instructions check out this:
https://asic.to/documentation/ it will detail pretty much every step involved for the S9. It will also be similar for the 17 series when ready. But 70w/th is def doable with S9. With 17 series I have not even played with downclocks yet but I plan on it once my next machine lands but it should be promising.
If you don't have a computer at the that location Phil you should setup like a raspberry pi with a vpn client running on it. That way you can always just vpn and play with them. (also could then TV into you and help if you needed it)