In general I think it is a terrible idea to start one college with the intent of transferring out. This will stand in the way of your making meaningful friendships, developing relationships with professors, and getting involved on campus. Then if your transfer doesn’t work out as planned you will be really stuck. I’d go to the college you choose with the intent of staying all four years. It is fine to throw in a transfer application (which should be completed with way under 200 hours of work) but don’t count on it working out. I certainly would not cut into your freshman expereince (ex. doing things you don’t want to do) on the slim hope of transferring to Stanford.
For Stanford in particular I would not count on a transfer happening.
–If you look at the common data set Stanford accepted 24 out of 2,466 transfers in 2019 and 27 out of 2,352 the year before - ridiculously low numbers.
–It is unlikely you will do anything freshman year of college to change the school’s decision.
–It is hard to make the case that you cannot find academic fulfillment at HY or P.