Hmm. I don't know how committed you are to ray tracing, but those numbers are using the RT Ultra preset, which isn't really AMD's forte anyway. If you look at the regular raster benchmark @ native, with ultra settings, the numbers for a 7900 XT are pretty strong.
From my perspective, if you're just trying to achieve "decently playable" for 1440p UW, with most things turned up, then a 7900 XT or 4070 Ti Super (~£700-£750, or less) would be ideal for their price/perf..
If you can afford better, then it'll help you keep the shinies enabled for longer, but either of those cards will feel like a new PC and blow your 2060 away.
Heck, just a 7800 XT or 4070 Super would be a decent upgrade, but for UW I do think it's worth paying a bit more for the next tier up, to give you more headroom.