We have made little screens to go over the litter. The screen is a tight net, so that it doesn’t hurt their feet. It allows the urine to go through, but keeps the poops on top and that also makes it easier to clean as I can easily dump the poo without wasting litter and hay, and it keeps their feet clean too. Jacks feet are white white! (This was a picture from a long time ago, when I had my other bunny, Forrest, a young netherland dwarf -(hence the tiny poops)

Anyway, at the time we used cut mesh wire netting stuff and then glued corregatted wire covering around the edges (You have to do that otherwise the edges are too sharp.)
We did find a better way to make these, but we in the process of developing them to sell soon - patent pending, so I can’t yet share the full litterbunny secret!
This is also great for diggers, because they can’t dig all the urine up and around. Saves alot litter waste too due to that too because when I lift up the netting, ithere is usually just a perfect roundish area where the pee has settled. Easy to scoop up.