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Hello Gramcookie
The short answer to your question is you could combine Stoos with Stanserhorn, but I would suggest that is not a good idea, There is enough hiking in the Stoos area to keep you busy for several hours.
For the record you could get from Stoos to Stans (at the foot of the Stanserhorn) by taking the funicular down; then bus to Schwyz station, then train via Arth-Goldau and Lucerne. (Luzern in German.) This journey will take about two hours!
https://www.myswissalps.com/activity/stoos/
Combine Stanserhorn with Klewenalp?
Stanserhorn is arguably not an all day trip: https://www.myswissalps.com/activity/stanserhorn/. You could combine Stanserhorn with the Beckenried-Klewenalp cable car, which (like Stanserhorn) is free with the Swiss Travel Pass: https://www.myswissalps.com/travel-ticket/swiss-travel-pass/.
There is a bus which runs twice an hour from Stans to Beckenried and only takes about twenty minutes.
To get back to Luzern the quickest route is via Stans. But the hourly boats are of course more scenic, and take 75 minutes for the voyage, They arrive in Luzern at 47 minutes past each hour, in good time for the fast IR70 train back to Zurich at 09 minutes past each hour.
Best wishes for your detailed planning.
Roger