Advice on "selling" a standard proposal: make the data and feedback that led to design decisions public. Saying "trust us, we got feedback that X won't work but we can't share it" works poorly. Especially if everyone else is suspicious of you and doesn't trust you to start with
Yeah, I'm not saying this is easy... Best practices often aren't. The ones that are, rarely need to be called out as best practices, because doing the easy thing is the natural thing to do anyway.