These things other than "denazificiation" seem workable - Ukraine neutrality probably means no EU and no NATO, giving up Crimea is probably going to be hard to swallow but maybe, given that Russia already holds it and has held it for a while, maybe ok.
I'm just not sure what denazification means - this is an overarching goal that needs specific details. Giving up the separatist regions? arresting Azov members or leaders? I think
And, just to say, it seems Ukrainians are amendable to maybe neutrality so far. So, we've got 1/3 and 3/3. Good diplomacy (and hard bargaining) would indicate we get 2/3 and everyone goes home unhappy. But... who knows what the western bloc would do to sabotage or add fuel to the fire?