Hi I am in Tokyo now and I have tried both queuing and asking around different stores.
Ginza store had one each morning while my stay there and I have luckily scored a B35 in light grey, while my queuing friend have scored a Beautiful tadeklakt etope K32 the next day and the limited edition birkin 35 in gold and amber. From chatting with other queuing buddies, the bags are mostly big sizes and sometimes they might not have stocks in the morning.
As for stocks in other stores - i have got some luck in shibuya stores which offered me K32 in dark yellow, B30 rose lipstick, B35 Barenia and B35 Toffee in the last 4 days. Unfortunately they aren’t what I was looking for so I let them go.
As for exotic bags - I saw a KC in ginza store and constance 19 in the takashimaya store.
Hope this is helpful to you