I'll try it in Win 8.1 and save the Win 10 installs for later. The real test will come when a Windows update finally breaks Classic Shell.
Sounds like a plan to me, You could also do some googling for others experiences with it in Win 10. Just as an example, I found this -
https://www.tenforums.com/windows-10-news/99582-classic-shell-no-longer-development-now-open-source-61.html