Hello! My husband and I have a trip coming up to Tokyo Disneyland and DisneySea next week, and I have 2-day tickets prepurchased through Klook. However, we will be attending the parks for a third day, and would like to upgrade to a 3-day Park Hopper for the third day. We are arriving at the Ambassador late on Tuesday night and all the guest help booths at Maihama & the park entrances will be closed. The first question is: should we wait until entering DisneySea on the first day (which I have read I can do with just our QR-code having Klook ticket printouts), get on our first rides/get the day going, and then deal with trying to do the ticket upgrade after we are safely in the park on the first day (in the interest of getting the time-sensitive morning things out of the way first)? Does it seem likely that a late-night counter/concierge at the Ambassador would be able to do this upgrade for us? The second question is: will it will be a problem getting the early Happy 15 entry since our tickets are from Klook and not purchased through our hotel reservation? Does it seem like showing our reservation on a printout or showing a hotel key (?) would be enough to prove we are staying onsite for that line? I'm not sure how one proves they are staying onsite in this instance. Thank you so very much for taking a look at my questions. I discovered the DisBoards last year before a WDW trip and although I haven't spent as much time as I'd like on here, I find the people to be remarkably helpful. Thanks!