Also 5m vaccinations a week seems a big ask and in my mind throws your dateline into jeopardy. I've not seen it suggested that they can cope with that many. I've seen articles saying something like "if they could get to 2m a week".
Having said that they are ramping up enormously and I guess if the Oxford vaccine becomes available then the main obstacle will be the sheer logistics of it.
Still, I like your plan.
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