It is too big but it won’t go down.

on my speedmaster auto day/date it's used to change the day of the week indication.

Nope

pre-aged steel feels gimmicky to me

I prefer if no one notices. I wear them for my own enjoyment.

nah, if I am wearing a device that can tell time on one of my wrists, I would feel weird wearing another.

It would be an admission that I am wearing jewellery and not something useful. Which is sorta true, but I don't want to admit it.

It's OK. Of course a bit on the big side. But after all it's an aviation inspired watch. I went 37mm for the time-only spirit because I wanted it to be a perfect everyday watch, but, you could argue that traditionally aviator watches tend to be big.