Well, ladies, I've found the "
posture police."
I brought a long dressing mirror to the side of my workstation. I catch a glimpse of my bad posture and I'm immediately trying to straight up and correct my posture. I'm stronger now so I can hold up longer.
I've also brought two more balls to use in my chair for my back. one for my low back and sacral area. one midback and one at my scapulas. this is working. I'm sucking my gut in... as much as I can. (balls can be aggravating sometimes

)
I can use Kinesio tape to pull my shoulders back. that helps.
As far as a brace, so far all that I've seen would be intolerable. Not seen the ones you all are mentioning.