Why on Earth do you restrict yourself to the "Windows clock" and specifically the Win 10 one?
Google windows clock portable app stay on top
Oh look, there are several.
Also web clocks, like
https://time.is/Start building yourself a set of portable apps, that are NOT 'installed' in the Microsoft way, but just run self-contained from any folder. Keep all of those in one folder tree, that you can clone and copy to as many PCs as you want. And more importantly, for as long as you want, ignoring Microsoft's attempts to make users abandon almost everything ever time they switch machines or Windows versions, because reinstalling everything is such a pain.
There's no good reason why software should have to spread itself and its config data all through the operating system and the Registry abomination. Well, unless you are Microsoft, and _want_ to cripple everyone's computing experience, for profit and ideological reasons.
http://portableapps.com/