I have S49 Mk2 and they’re about 4mm and look like they would come off easily. There appears to be a plastic surround that they locate into which is 0.5mm, so you would be left with that.
Go full screen on the image, it’s high resolution (ignore the dust lol).
What is the actual height that you have available? And does it wobble when you slide it in/out? The knobs would be my main concern if they got caught.
However, it may be possible to replace them with shorter ones?
It’s very hard to measure the total height - as the knobs are the highest point but they’re not near the edge to put a ruler by them, but i’d say without the feet you’re looking at around 78-79mm.