The link to the other forum thread? Doing this might work okay for you:
As long as the grid view itself isn't doing any extra drawing, doesn't have a background image, etc. That said, I haven't actually tried this so there may be caveats I'm not thinking of now. Selection highlighting might get tricky, for example. You'll also need to pay attention to the order in which you're drawing your grid and your sprites via Playdate.graphics.sprites:update() (you'll probably want to draw the sprites first).