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thanks @Hjusth for the info. In the end I've bitten the bullet and went for a full Chorus 11sp cassette (110 euro) + and new TA chainring. Didn't want to mess up the new chain (potenza) and cassette with a worn chainring.
Curious about the durability of the potenza chain. I've used a KMC 11 speed and was suprised about fast (<5000km) is was completely worn out (1.0) . This messed up the sprockets and the cassette and also the chainring. I'm quite strict in cleaning + greasing though. Will check wear more regularly for sure.
Thought I’d replied.
You could get a centaur 11sp cassette for much cheaper, and there’s little difference in terms of performance.
Alternatively you could get a Miche cassette for near the price of the sprockets you’ve identified. The cassette is entirely loose cogs so replacing one cog would be easier in the future. It’s so much cheaper you could afford a cassette and 2-3 SRAM chains instead of a Potenza cassette. Just make sure you get the right cassette for your freehub!
11 speed drivetrains don’t have as large a tolerance for misadjustments as, say, a 9 or even 10 speed would, so the general consensus is to change chains at 0.5% wear, and change cassettes every 2-3 chains. Changing single cogs one at a time until the casete works perfectly might prove tricky and more expensive than getting a new part.