In sock form, a bottom row keyboard wouldn’t fit, I’m afraid.
The bottom modules, the touchpad and side panels, side into tracks. This takes up space that would be needed for a keyboard.
See this picture of the side module showing how much room it takes to accommodate the tracks. Also note that there is dead space at the top where the row of input module data & power connectors are.
You’d have to modify the laptop, remove the tracks to cut them down to a smaller size, or create a different method to secure the modules. How hard that might be remains to be seen. If it’s not too hard wouldn’t be surprised in someone did it (likely only as a personal DIY project). But even with the tracks removed, it looks like there might not be room for a number-key row.