Good points.
A lot of the ideas for the SFAB brief well but are impossible to implement. The company that @Il Duce and I were in was the linguist company for the Second Infantry Division in Korea. To get the kind of language proficiency one needs to actually be useful in that language takes something on the order of 16 months, not 16 weeks. And once you achieve proficiency, you have to maintain it or you'll lose it. Language maintenance consumed a large portion of our training week. When I commanded the support company in 5th Group, the language proficiency expected of the SF soldiers was 0+/0+, and even then some couldn't sustain it because they were consumed with all of the other tasks expected from them.
And even if you train someone up to a usable degree, will it be a usable language? OK, so you train someone in Arabic. Maybe Egyptian dialect. Is that going to be helpful when they get sent into Pakistan? No? So why bother with it at all?
Kill the SFAB idea, make the training a school that confers an ASI (additional skill identifier), assign individual brigades the SFAB mission on a rotating basis.
Also, what does the language get you? You're telling me some 'expert' from an SFAB is going to teach me to run BN/BDE level operations when they've got the language skills of Jean-Claude VanDamme in Bloodsport? No way, even if they had the technical expertise beyond the language - and I'm not convinced any training the SFAB does is going to impart that expertise. Plus, as @Marauder06 says that maybe gets you set for a couple countries.
To me, any country with the resources, organization, and commitment to field BN/BDE sized units to train ought to have the ability to provide interpreters. That to me is a part of the strategic problem in the first place - without the right commitment from the HN, the will to organize and fight, it doesn't matter how much training we do with their yahoos that show up. They're going to lose, we're just delaying the inevitable. Without a better way to pick folks with a chance of winning before dropping a few Trillion dollars on them we're wasting everyone's time.
Uh-oh, it appears I've stepped on a cynicism mine...