Is Using 24V Power Supply With Buck Converters for 12V DC Shades Over 100ft Viable?

Greetings.
AV guy looking for some advice on a powered window treatment project. We have 9 windows that were diasy chained with romex by the electrician on the job (should have been home run with low volt wire). The shades to be installed are 12v DC and come with a 700ma power supply. I have not measured the actual draw but can. The plan now is to put a larger power supply at the head end to power all the shades. Voltage drop is an issue. The first window in the chain is about 100ft from the panel, and each window is about 10ft from one another. We are considering using a 24v power supply with buck converters at each shade motor. Is this a sound method in this situation? Wondering exactly how EE experts would do it.Regards,
pj_0

Phil,
Since you have romex, do you also have wall outlets? If so, the simplest solution might be to install each shade with it's own 12 V power supply. This would also be the cheapest solution  if the power supplies come with the shades. Otherwise, I'd be inclined to run 24 V and buck converters at each shade.