@Alex Do you have a part number ? What you speak of is not available in N. America.
Even so, it'd be no more permanent than any other hose end of theirs. Press in the two tabs and swap out the end. For me that's better than the added length and stiffness these adapters add to the setup.
@Untidy Shop - you link the Nilfisk type adapter that was mentioned by andy already , which is very similar to the Bosch that T. shows in his pic.
These are available in N.A. but aren't as good as a dedicated and rotating hose end that takes 36mm to 27mm tools.
Ideal no. But if one is going to use a 36mm hose on 27mm port would the "best" solution be a factory rotating end ? Clearly enough people want to use this type setup shown by the myriad of "adapters" on the market.
If we're buying into the Festool as a "better mousetrap " - shouldn't it be better ?