I'm not excited by the J&J. The two things I want from a vaccine are, first to avoid the risk of hospitalisation and death, and second to prevent transmission. If I remember it right, the J&J vaccine just reduces the risk of death by about 4/5ths and the probability of being infectious by less than that. So you still need to worry and the disease can still spread.
Two doses of a better vaccine isn't a bother to me, although it is in some ways more expensive to administer.
Having said that, I agree with you in your target market. I'd aim it at people aged 20-30 for whom the risk is already very low. Or as a booster for people who have had covid already.
I remain thrilled by having had the AZ vaccine. UK covid deaths have almost vanished. At worst the numbers show the AZ vaccine has a very slight risk for younger women. But the risk of having covid is far, far worse.
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