Yup, that's very possible; when I do manual color inversion I usually fill a layer with the film base color, and use the "subtract" blend mode to account for it

Yup, that's very possible; when I do manual color inversion I usually fill a layer with the film base color, and use the "subtract" blend mode to account for it, else I get much "cooler" colors not unlike what is shown in the demo movie.