Ok, so if I’m understanding correctly, you have your 202 connected to the Yammy using the pre-out so you can switch between using the Naim gear for 2 channel listening & the Yammy for surround sound movie duties.
If you’re thinking of downsizing the equipment.................
Any soundbar will not sound as good as a regular AV 5.1 set up.
Even the Sennheiser Ambeo at £2k won’t out-perform an average 5.1 system. And that thing is blooming massive.
Soundbars are all about convenience, less boxes, less wires etc. They can do a decent job, certainly an upgrade from the speakers built into a tv, but not as good as a 5.1 system.
So it comes down to your expectations & how much quality you are prepared to downgrade to go from your yammy 5.1 system to a soundbar.
The new Sonos Arc bar, with a couple of Sonos ones as rear speakers & a Sonos sub may well be a half way house between your existing AV system & “just” a soundbar. You could add a Sonos Port to your Naim system to access the streaming facilities to partially integrate the 2 systems together. This could be done in stages ie start with just the Arc bar & add the surrounds & sub at a later date when funds permit.