Why don't you just call whatever branch is nearest to you direct and have a conversation with the SA/Manager, explain what it is you want and they can advise you how long you can expect to wait, what the costs will be etc
There isn't a Goyard store where I live but I will be London for 5 days so I just thought they might be able to my initials in that time but if it takes weeks then I will just get the tote without personalization. Thanks anyway!