Tobias, you deserve a medal.

If you want to try it out, Redditor Prezombie has the lowdown:

To play with this yourself, Either clone and build the github project or download the binary here.

Install residualvm and use it to set up Grim Fandango normally.

Copy the file mouse.lab from dists/engine-data into your game data folder (where data000.lab etc. are located), and overwrite the ResidualVM.exe and the SDL.dll with the files in the zip, then run ResidualVM.exe.

It's a working alpha, it's playable, but expect bugs. Report bugs to the github.

Now all you need to do is track down a copy of the game itself, since it's not really available...anywhere.