You know, I love this point. Thank you for the solid post. And I hadnt considered this angle prior. That alone is the single best argument for receiving the vaccine in my case. At least I can control when I get sick even if the symptoms Id get from both are very similar. Assuming that I will get COVID which I guess is still in debate since we dont have data in my cohort as you suggest and I have wondered about.It all seems to be about a risk vs benefit and @haw-key seems to be somewhat at the balance point where the evidence doesn't trip the scales to one side or the other. So, given what we know or suspect, I think it becomes a mater of convenience really.
If you don't get the booster, you may (more than likely) get covid. This will likely result in several days of being ill, but could be worse, could be better. The timing of this event is unknown.
If you do get the booster, you may (more than likely) have bad side effects for a few days. The timing of the event is controlled by when you schedule the booster.
Possible Covid (unknown timing) vs Booster Side Effects (known timing)
That is all I can come up with for someone in your case right now without more data. Specifically data about how your cohort (booster & no booster) fare against covid.
Lastly, though I haven't asked all my colleagues, I get the feeling that the booster has not been as universally received as the initial series was by physicians/providers. So I suspect am am not the only one with similar consternation. Those that have told me they received it said they reacted in a similar way to the second shot. Nothing, mild symptoms, or significant symptoms depending on the individual. Which I was hoping I wouldnt hear. Hoping they'd all say, piece of cake