To generate this, just do a search and replace on virtualkeys.A43, replacing 800:480:54 with 827:480:27 in the whole file. (Make sure you save a copy as a backup.)
This might give a nice compromise between usability and not cutting off apps too much. Or for a much moral radical thinning, one can do 840:480:14, but that'll only be usable with a stylus or fingernail.
You can also add other keys with other functionalities, but unfortunately they don't get labeled.