Book is finished and ordered! Just in case anyone else finds themselves looking for a very versatile kit for an entire album, I'll share what I ended up using. I love using the limited edition special event collabs for things like this since they're huge.
My main kit was the SSD Collab Best Day Ever.
I also made some pages with the 20/20 Collab.
And I ended up using a few papers to mount everyone's hand made (or digital) card. Those were from a birthday kit by Flergs and Studio Basic, but it looks like it was retired since I can't find it in the shop.