I'll put another plug in for Fabarms. I have a Beta Classis
with English and splinter. Barrels are rated for steel/no-tox. It's a great field gun.
Light and handy. It only comes with single trigger though.
The barrels also flare quite a bit at the muzzles because of the choke tubes.
Not perfect but very functional.
Regarding current new guns, I'm not sure I know of any that meet all your criteria.
The S&W can be had with double triggers and no tubes but only come in 20 gauge.
Not sure if you can get the Fausti DEA in 12 w/double triggers and fixed chokes,
but I'd research those a bit too.
Not sure I'd shoot steel through a Uggie/Aya/Arrieta/Garbi/Grulla...
Good luck searching,
-Jim