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Depends on whether you want the chain completely surrounded or not, but these work well to prevent chain drop to the inside.
http://n-gear.com/index.html
As in something like this?
https://www.ebay.co.uk/i/311393074837
Might be a bit too cheap! Would that really work? I guess a shim for a derailleur clamp and a 31.8 chain keeper would work too..