Glacier 3000 and Gstaad in September

My wife & I have a lingering question… Will Glacier 3000 be worth our time & effort to get there? We’ve seen the pictures, videos & reviews, so we know it will be breathtaking. We will be on a 15-Day Swiss Travel Pass in September and Our Hesitation Involves Two Things:

1. Prior to going to Glacier 3000, we plan to have already visited Mount Pilatus in Lucerne, the Matterhorn Glacier Paradise in Zermatt, and also Jungfraujoch & First (during our 5 days in Lauterbrunnen). Will it be more of similar things we’ve already seen?

2. We only have two nights in Montreux and a visit to Glacier 3000 would have to be “squeezed” into our train travel between Lauterbrunnen (8:30) & Montreux (19:13). a) which involves a 2hr-20min trip to Gstaad (w/ 2 changes) and a 34 minute bus ride to Col-du-Pillon. Return to Gstaad (by bus) and then a 1hr-36min train to Montreux. b) Will 4 hours be plenty of time at Glacier 3000?

We would appreciate any feedback from those who have visited Glacier 3000 and/or have knowledge of it or the journey. Thank You.