Oh well you still have the option of dressing up in a ridiculously safe way lol. A mask with very good protection, the best possible if you want, and also dressing up accordingly. And you can be like, if you go in and have to wait in that long line, you can ask the person next to you to keep your place in the queue and you then can go outside and only check back in from time to time to see how much more you have to wait before it's your turn to receive the vaccine. You can also check if there is possibility of ensuring ventilation (e.g. opening at least two windows/doors in the right positions). There is a calculator online too about how you can ensure maximal protection and how long the protection may last, I can find the link for it.