> - all widths like borderwidths, decorations, separators etc, set in
> pixels do not scale with the dpi settings. Could we use "mm" for their
> settings instead?

Definitely! The defaults in Tk use pixels, but you can use mm for lengths:
tk.Label(root, text="foo", borderwidth="5mm", relief="groove")

> - checkbox, radiobox the indicator appears tiny wrt the text

This may be related to https://bugs.python.org/issue41969, in which case
you're just waiting for your repos to update Tk.

> Is there a way to detect from tkinter a high res display and force a
> window scaling x2 for everything?

IDLE has a `fix_scaling` method. Maybe you could use something similar? 
https://github.com/python/cpython/blob/da2e673c5/Lib/idlelib/run.py#L313

Hope this helped!
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