Have you tried websites that will shop for park souvenirs and ship them to you? I haven't tried them myself as shipping to UK is ridiculous but i like to look whats available in the parks :earboy2:
This is one of them - www.yourwdwstore.net
I like watching The Tim Tracker for daily videos, Adam Hattan has some great videos from his trips and i follow livingbydisney on Instagram - don't think she has a youtube page but her website is livingbydisney.com
Have been looking ahead for my visit in September next year and just found Pammie Plus Parks on YouTube who has videos about riding rides and shopping at Disney as a plus size person which might help others planning trips too.
Have a brilliant time, a bit late now but have you seen Adam Hattan on youtube and here http://www.adamdoesdisney.com/ he has some great tips and vlogs as he is working there now.
I wear something similar to the waistbag which i either wear round my waist or as crossbody bag. In the UK we call it a bumbag not a fanny pack as yes that means something different to us.
I have been thinking about a solo trip from the UK too in sept 18 and was looking at 10 days as well, 7 days is too short considering the flight time and possible jetlag :)