It may be possible to mess with registry settings to force the inversion, however you don’t need to do that.
Personally I would stick with shortcuts as you have that invert on demand, for viewing negatives.
You can add them to SendTo or drop a folder of negatives on the icon etc.
What -invert-colors does was provide one short command amongst other several older depreciated ones such as
-set-color-range #dddddd #333333 but in essence it replicates this
TextColor = #ffffff
BackgroundColor = #000000
so setting those values means that you get the opposite effect when using -invert-colors thus should then make things “normal” !
You can get into smelborp when playing around with reversing colour ranges, I had to delete the settings file to prove it worked as you require, but the result same as -invert-colors is not good for everyday use in 3.2+ compared to 3.1.2.
hence my suggestion to use the shortcut as normal just when its needed.