Keep it. If they can’t find a reliable vaccine for the common cold which is a coronavirus in tens of years, they ain’t sticking something in me that’s been produced in months!
I'm not sure if you're entirely serious about this. I've had some similar concerns but I came across a very authoritative article which explains how everything has gone through so quickly. I'm not concerned at all. The article only refers to the Oxford vaccine.
I will try to find it for you but the basics are this. The Oxford team decided years ago to create a basic vaccine which could be the building block of a new vaccine should it ever be needed. This decision was taken after the last Ebola outbreak when there was nothing available.
The basic vaccine is a chimpanzee cold to which it is possible to "bolt on" other necessary bits. Once the Chinese released the DNA structure of Covid-19 Oxford was able identify what needed adding to the basic vaccine. Effectively they had a huge head start.
The practical issues regarding getting a vaccine approved primarily revolve around money, trial volunteers, production and results review.
Funding was not an issue when normally the process can take years of application and rejection. People were falling over themselves to volunteer to be in the trials - usually finding 30000 volunteers takes a long time. The approval bodies agreed to fast track everything and of course we know AstraZeneca took the chance on starting production ahead of approval.
Fundamentally what has happened is everyone got on with it, removed all the usual hurdles such as funding and when coupled with Oxford already having the basic vaccine things could move very fast.
In our age group I doubt there's enough Pfizer for us. I'd expect to be offered Oxford and I've no hesitation in accepting.
