I'm still playing with QtWinExtras which might offer a fairly simple (if supremely silly) solution to this issue. If it works, there'll be more lines of code involved in getting cmake to find/link Qt5::WinExtras on just Windows (and getting the InnoSetup installer to make a new registry subkey) than there will be C++ added to MainWindow.
No promises, but I'll post something here if I get to the point where I have a beta for others to test.
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