Chrome book Operating Sytems

I'm a volunteer at Willow Creek Community Church which has a ministry call Computer Connection. Where we refurbish donated computers that will be given away. I have two Chrome books that were donated and I seek to replace their OS with a license version of Windows 10. As we are a non-profit which as is license by Microsoft to use their OS.

The USB flash drive (2.3 gb) I'm using has  Windows 10 Pro and Windows Office and a few other programs to be installed.

This will override Chrome  and erase all and everything the previous owner put on this Chrome unit. I think if everything goes right. Maybe I shall ask if it can be done without opening a can of worms?

Thank you

Richard Cornell