There is indeed something satisfying about a "proper" GMT with an independently adjustable hour hand and I imagine travelling with such a watch is good fun (I am enough of a movement geek to enjoy adjusting the hour hand on my Omega 8500 watches without hacking the movement). FWIW the mass-market autos I've had with GMT functions (either based on the 7750 or the 2836) have all been "conventional", with the GMT and hour hands linked and without independent adjustment of the hours, so hopefully Seiko make this movement available in some interesting watches at a sensible price point.
I recall that the 5M Kinetic movement in the Seiko SUN019 (and similar) is also a "true" GMT, so I guess this is a Seiko-wide approach to executing a GMT function.