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I've programmed my keyboard (bit round the houses as I can't directly assign copy and paste keycodes) so Fn+X/C/V send XF86Cut/Copy/Paste.
It works in Firefox. Yay!
It doesn't work in anything else I've tried, but according to that article GTK and Qt are being updated and they usually handle copy/paste rather than the apps themselves.
Looking forward to ditching Ctrl+C, which should never have been a copy shortcut in the first place.