I can't understand your contempt for OP's teacher, or their intentions. It seems (you've mentioned it multiple times) you are basing it off one comment about "french horn embouchure". Clearly the teacher understands they are out of their depth when they sought out a local professional. Does that mean that they "can't be trusted?"

I also can't understand your contempt for the musicians of the Seattle Symphony. I agree that commercial success is no indicator of good pedagogy, but when choosing between a clarinet teacher or a professional trombonist in a major orchestra.... surely, surely they can at least point them in the direction of someone who, if they couldn't themselves, help in this situation.

Here's the biggest one. I can't understand why you think that somehow nobody understands embouchure, only specialists. Everyone else is wasting OP's time by teaching "how they learned" and not some magical formula that you can only get from a specialist. Do you really think that the hack in the local orchestra surely can't know what they're talking about, I guess they've only won a professional audition (or many international awards and a very impressive bio in the case of Yamamoto if that's who it is) /s

Do you really think one lesson with an expert over Skype is more beneficial than creating a long-term relationship with a local professional mentor? I'm interested to know your reasoning.

I think a much more generic and overall solution to OP's problem is to find a teacher who can work with them on a much more regular and thorough basis on developing overall.

P.S. Props to Doug (no H) and his work, just don't think that's the first port of call in this scenario.