The separate monument which allows you to display Minis, well it should allow you to display holiday hats too. I'm feeling too lazy to explain the benefits, but I'm sure you'll understand. After all, there really isn't a reason not to agree..
This is a great idea. It fits in with the theme of the devotion monument, and it can't really cause any harm. Having these hats transferable to GW2 won't cause any damage either.