Does he have a litter tray OO? Maybe one of those corner ones if he pee area is a corner. Charlie used to like to sit in his for a while after a pee. He would pee in the very back corner then sit in the front part and have a wash. I think he still does, I just don't get to see now because it's in his house
His potty tray is his ensuite bathroom
I put chinchilla sand in it.
He must be very comfy if his man bits are down and dragging. Or is it very warm where you are right now? Is Paladin a Syrian (sorry I can't remember now you have four lol). If so one of the larger litter trays might do the trick and double up as a sand bath.
I have this one which is just normal size - fits nicely in a corner.
https://www.amazon.ca/Trixie-Hamster...=hamster+potty
This one is bigger but not massive - one reviewer says it fits two rats
https://www.amazon.ca/Ware-3360-Plas...ACS42RNSPBKA1R
Or just some kind of dish you have already - doesn't have to be corner shaped. Or move his sand bath to that corner if he has one.