If the kmscon project wasn't dead, they'd be able to get whatever number of cells and rows they'd like as it doesn't use now-obscure built-in display device modes by setting the font settings.

On the other hand, kmscon is just a graphical terminal emulator and display server built into one. Running `cage foot` (i.e., the very minimal "foot" terminal emulator running under the single-app "cage" display server) and setting foot's settings to whatever you'd like would get you a better (and importantly, fully maintained) experience.