Have you tried evaporating clouds by Eliyahu Goldratt? (They’re from his book It’s Not Luck. Also Elliot has some examples here: Evaporating Clouds Trees.)
I used them a little in the past and remember finding them to be clarifying and helpful for brainstorming win-win solutions that I didn’t feel conflicted about (or at least felt a lot less conflicted about).
I think a lot of the power of evaporating clouds is just in articulating the conflict and making it explicit. Then it’s easier to think about.
Also the step of finding a shared goal is another part of what makes evaporating clouds super helpful I think.
PS After writing this I did a search and found that you have mentioned evaporating clouds before here.