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My inclination would be to hunt down a Fox 34 Rhythm or Performance, with the FIT Grip damper. It's a proper cartridge damper with good basic architecture (i.e. IFP, shims, no platform/lockout). It's OEM spec on plenty of bikes so you'll find new or barely used take-offs. If you need to change the travel it requires a new air shaft.
Eg:
https://www.ebay.co.uk/itm/372854209079
https://www.ebay.co.uk/itm/193224096108
Air shaft (haven't checked it's an exact fit)
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I'm a little bit jittery about spending that much on something second hand with no warranty, as I don't know enough about the internals to say whether I've got a dud. But I guess eBay would side with me most likely...
The exchange rate is reasonably okay at the moment so there's this Debonair/Motion Control "Yari" for £340:
https://www.bike-discount.de/en/buy/rockshox-yari-rc-29-debon-air-tapered-offset-51-boost-932291
Looks pretty similar to the 35, maybe it's the same thing. Didn't think the Yari came with less than 150mm so suspect it's an old model?
Seems that way :|
Don't appear to be many megadeals on forks out there either. Should've bought the complete bike.