Gotta laugh at how architects just LOVE to place the TV locations in such awkward spots for proper viewing/listening. One of my pet peeves for sure.
In your situation, my suggestion would honestly be for a 2.1 setup like the SVS Prime Satellites + one of their subs. They're $135 each and honestly can really jam. They have a basic 2.1 kit that includes an SB-1000 for $699.99, (
https://www.svsound.com/products/prime-satellite-2-1) I've seen them let customers swap it for a PB-1000. Honestly if you can fit it in though, your room might demand a larger sub due to its dimensions. Still, even an SB/PB-1000 plus the SVS Sats would absolutely smoke the setup I see in your picture.
EDIT: FWIW, the SVS Prime Satellite dimensions are 8.75" (H) X 4.9" (W) X 6" (D). They've been just the right tool for the job with many of my customers who were stuck with a less than ideal offset layout. With a stereo pair of speakers, one thing that is nice is how you can toe them in/out to get your stereo imaging dialed to your main listening position. That's the one downside to most soundbars, although a sound bar may honestly be the right way to go in your situation if you can't find traditional speakers that will work out for you.