But Stephanie the UK policy on vaccination and travel is irrelevant here. It is up to the EU and other nations to specify requirements for travel and acceptance or non acceptance of people from the UK.
And to be fair, there is also no policy for mix and match vaccines in this jurisdiction either.
We do not have the capability as individuals here to specify our own a la carte menu for vaccines.
So what you have posted is moot.
But you post it with such vigour as to suggest there is some action we can take - there is none.