European Honeymoon Plan

Hi all! This is a long one so I apologize but I could really use some help.. Looking for advice on a possible European honeymoon. My fiancé and I are getting married at the end of next august (2026). We were thinking about honeymoon destinations and I unfortunately got an idea in my head that I can't get out. I was thinking 3.5 weeks across 4 countries – Greece, Italy, Switzerland, Germany. I was thinking fly into Santorini (we are in New Jersey), then take the ferry over to Mykonos, followed by Athens with a total stay of 3 days at each place. Then I was thinking of taking the very short 2 hour plane ride over to Rome and stay there for 3 days and then head over to Tuscany for 2 days which is a 1.5 hr train ride from Rome. Then I wanted to head over to Switzerland but there's no direct train from Tuscany to there so we'd have to go to Milan. We could either do the 2hr train ride from Tuscany to Milan and then the 3.5 hr ride from Milan to Zurich in one shot, or go from Tuscany->Milan, stay overnight, and then leave for Zurich the next day. Then we would stay in Zurich for a few days and do day trips – 1 trip to Lucernce which is a 40 min train ride from Zurich(there and back), and 1 day trip to Interlaken which is a 2 hour train ride (there and back).. Then from Zurich finish out the stay in Munich and do Oktoberfest and then fly home.. Now please tell me, is this absolutely delusional or is something like this feasible. I just see it as we've never been to Europe and it's so much smaller than the US. I know people who take 2 hours just to travel to work everyday and in Europe you can travel to a different country with the same time. I would hate to be in Europe and have all these places RIGHT there and not go. But please spam me with advice or tips or tell me i'm being stupid. Thank you all!!