For what it's worth, I tick most of your positive boxes except I'm happily married.

However, looking out for absence of wedding rings as a reliable indicator of avilability ?

I have never worn or wanted a wedding ring.

Maybe it's a cultural thing, but here in the UK I've never known any married men older than me
or my same age who wear wedding rings.

Newly-wedded men in their 20s / 30s may have recently started to accept this fashion;
but I can't help suspecting they are soft touch victims of the grossly profiteering Wedding Industry ???