Save your money. BCFS work for the most part is a like a private club. If they don't know you or haven't flown with you etc. You'll have a hard time getting hired on with or without a mountain course.
There are a number of companies in your neck of the woods that have some great training and chief pilots. Who will teach you the basics of mountain approaches and what to watch for etc. 20 hrs. is over kill, even 5 would be a stretch. This training could easily be combined into your PPC training.
Spend your money on putting a face to the name. So much of this industry revolves around personality. Flying can be taught; working and getting along with clients is another skill all together.
IMO: being level headed, professional and forward thinking. Will get you the mountain training through your employer. As you become an asset to them, they will in turn will invest in you.
It's a two way street, at least in theory.