While you can travel from €49,90 in the 2nd class, I recommend at least once the 1st class Panorama Car. You have 23 intermediary stops, on a gorgeous route, but you can split it if those 9:31h are too much. It can also be taken from other stations, as I might give it a first try on the Innsbruck to Graz section.
Anyway, back to the reservation. Select 1st class, click on "Seat reservation", then choose from "Select a coach" the Panorama car 1st class, and then the preferred seat if that's the case. Ticket + reservation, €82,90.
quotingI found out only recently that there's a Swiss panoramic option on Austria's territory but with almost no details. Now I found this video and the mystery is solved.
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It's a Swiss SBB train operated in partnership with the Austrian ÖBB, called Eurocity 164 "Transalpin", from Graz, Austria, to Zürich, Switzerland. It doesn't pass through Vienna, and that's the reason it represented a total enigma.
This is not my video, but it is from Landeck (Tirol), Austria, and I'll come back with more details about the route and booking in the next few days.