Syd Smith wrote: Any tips and recommendations for best practices? ... But perhaps we can get some bonus wood for the occasional trellising project or tool repair in a few years.
Both those goals are perfect for small coppiced wood.
My understanding from research, is that you will have to decide how many of the sprouts you want to keep. You keep more sprouts if you intend to keep them quite small in diameter. If you want larger diameter material, you will prune them to a smaller number.
https://www.forestresearch.gov.uk/tools-and-resources/fthr/biomass-energy-resources/fuel/energy-crops-3/short-rotation-coppice/
Who knows what will happen with the Ash Borer. Some other insect might get them in check, or the "stools" you have just started (stool is what the coppice base is called) may develop resistance, so I suggest you cross that road when you get there.
This video is about someone in New York whose experimenting with Ash coppicing: