In reply to thelostjockey:
I did some climbing in the Stubai Valley in 2013, the area seems very proactive in providing information for outdoor activities. Should you have time there's all sorts to do, alpinism, walking, rock climbing, mountain biking and via ferrata and there's a lot of free information available both locally and online.
Click around on these sites for a start
https://www.stubai.at/en/stubaital/
https://www.stubaier-gletscher.com/en/
If you get time there are some excellent via ferrata of all lengths and difficulties described in a free topo from the tourist information office.
Specifically to your questions. I used the Eastern Alps (Dieter Seibert) guide for the alpinism. I only did one route in this valley from it but used it for a few elsewhere and found that in every case the routes had altered significantly from the description due to the ravages of global warming, in one case the route described was totally unclimable. That's not to say the mountains are all now too difficult or dangerous, just that this guide cannot be relied upon for information.
Websites such as camptocamp, summitpost, peakware and planetmountain may well contain more up to date info and would be worth researching. It would also be worth enquiring locally in the guides offices and failing all else, the hut guardian will definitely be able to give you up to date advice but of course it might be too late by the time you've got to the hut only to find that the route from that hut is no longer feasible!
The mountain we climbed from the Stubai Valley was the Zuckerhutl. The book describes taking the cable car to the Eisgrat and traversing east from here accross the Fernau Glacier before crossing to the Sulzenau Glacier. This crossing is now much harder and or more dangerous due to glacial retreat leaving steep rock walls and unstable moraine so the route takes a completely different line. The cable car no longer terminates at the Eisgrat, there is another section to near the Schaufelspitze. From here you traverse accross slightly to the south of Schaufelspitze and the Aperer Pfaff and on to the Zuckerhutl. There's some info on this route here
https://www.outdooractive.com/en/hiking-trail/oetztal/seven-summits-zuckerh...
The new route is objectively quite safe and easy, probably PD- and the line is fairly obvious once you get there.