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https://www.rosebikes.co.uk/article/xtreme-screw-arm-t-1-chainring-nut-wrench/aid:228744
It's the only sensible design I've found, allowing you to apply force and leverage in the directions they're needed (the Park Tools one isn't unique in being a bit shit).
I've not found it for sale elsewhere, although I'd be surprised if it wasn't something from Taiwan re-branded.
Postage is a bitch if you order it on it's own and of course now there's GBP/EUR to consider.
They make good saws, not sure about spanners.