So are you looking for an overall heavy switch, or just a switch with a tactile event so pronounced that it’s humanly impossible to avoid bottoming out? If the latter, does the actual weight of the “lightswitch” event matter? Any preferences on travel?
Note, I don’t really know the answers, but you can compare force curves here, and obviously this is a good place to find people who can help you if you can articulate the preference in enough detail.
You might want to see if you can find someone to let you try an Alps tactile board. The force curves are very different, but they might be closer to what you’re after.