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Oh, sorry, thought they had it 700c. There's a bunch of other tubeless rims on PX as well so have a poke about and see if anything fits the bill. If you can spend more than £100-and-a-bit spend it on the rims, think you'll get better value that way rather than getting different spokes or hubs. (I got the same hubs off AliExpress, only £60-something for the pair, but you can buy them in the UK for £70-£80)
If you're in London and don't feel confident about wheelbuilding there are people on here who've offered to build wheels for free. I find it quite zen and enjoy the process and I'm sure others do too.
That kom rim looks good, only 26 or 27.5 though.
Happy with 700c ATM.