I've seen that mixing two types 1st and 2nd has been used where people have a bad reaction to the first, and structured trials are now starting for the mixed approach (a mate has just signed up as a volunteer for that). But I haven't seen any reporting on 3rd jabs, mixed or not.
In the UK they check you against your NHS number/record at every step so you'd not be offered the option (I know you are not UK)
I had 2nd jab yesterday AZ at the Royal Marsden. In and out in about 20 minutes. queues at every point but moving fairly fast. No reaction at all this time (so far anyway).
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