The only part of the plan I'm worried about is separating the liquid from the solids. That's going to be an incredibly messy and most likely smelly project. Remember, I'm a pet sitter. I've dealt with runny poo. Even veggie-based diarrhea is yuck. Just ewww... Lol!
I'll stayed tuned for that part, because I think it's going to be highly entertaining. You're a brave man, @papa-pepper.
Oh, and I'll say it now - better you than me.
;~D
I will drain the liquid onto existing plants, as a liquid fertilizer. The remaining manure will be applied to the soil where I will plant.
I'm sure the plants will absolutely love it and the grass seeds will be ancient history.
My only concern was prep for application is going to be - 'aromatic' at the very least. Fermented grass clippings/rabbit poo is bound to have a strong odor.
Maybe a cheese-cloth type strainer over the top will make it more manageable? Honestly, I'm trying to think ahead & suggest an option that might help...
NO problem, I understand. I've dealt with enough soupy rabbit poop in my time to not really be worried, but I get where you are coming from.