There are stands out there that you buy to sit them up without having to do any modifications to the case. The height of them should make it so that the handles don’t touch the ground.
Edit: These should work well...might need 2 since case is long but this would even put it on wheels for you.
https://www.amazon.com/SY-ACC65063-Desktop-Computer-Rolling-Adjustable/dp/B0096KK76W
I will look into finding a knee bench but do you also think something like this will work?