At the risk of the stating the obvious, I think it's worth pointing out that the only reason why US SOF forces are associated with training and FID is a confluence of circumstances from the Cold War. - EG: SF used to train Guerillas, based on WW2 experience.

I cannot see anyone wanting to "train Guerillas" these days, but the need to train and sustain large numbers of security forces is a definite plus, but I cannot see any logical reason why this would be associated with SF/SOCOM, apart from the accidents of history.

Yes, I can see how one can make a very solid case (languages, skills etc) but the ability to train is inherent to a professional military. All officers and NCO's are, or should be trainers - in an ideal world, capable of training Indigenous forces for the equivalent role.

The reality is that culture and human needs, undermines this. But be aware the British Army went around the world, raising generally limited successful clones of themselves (India, Jordan, Pakistan etc) - and USSF themselves could be said to be descended from a British Army trained Unit!!

...however, if you just adopt the colour of the beret (Canadian Rifle Green) and not the mess silver, traditions and mess kit, it isn't quite going to be the same thing!