For comfort, I have a bucket, set up under a disability lavatory seat, and I either empty it as is, or add about 5 X water. Citrus trees love wee. I also add it to compost. I'm not wasting water on unnecessary flushes. If you have visitors that day, maybe put some sand in the bucket, then put in compost? Or tip sheep manure in, enough to soak up the urine, then tip out and rinse at the end of the day, for the night ahead. Maybe get a bucket with a lid, to empty, with visitors and ask them to fetch something, when you want to pour out. If you bury a pipe, 3 to 6 " wide, 4' down, every time you plant a tree, you can pour wee down the hole, to feed the tree. BUT please put an empty tin can over pipe, at top, to ensure nothing goes/falls down and also, to prevent evaporation. If you do a 6 to 12 inch pipe, you can put kitchen scraps, dog poo, etc down the hole, and if you watch it over months, you will know how often you can put more in, to be eaten by worms. I usually put about a foot of fill in, and a bucket of water, to help the worms. I try to remember to pour a bucket down the compost pipes, once a week. If I could, it would be every 2nd day. Use an old bucket, with a crack, or with broken handle, to put over the top.
I can't help thinking that tipping dry sheep poo, and maybe sawdust, and leaves, would soak up wee, but even so, you have to mix it and get air into it, or it will be really rank. I think just sitting in a bin, you'd be better off emptying it atleast once a week.