So you need a braze on chain keeper? How about this fella
https://www.westbrookcycles.co.uk/k-edge-cyclocross-clamp-on-chain-catcher-single-xl-braze-on-p299810/s494900?
Another option might be an inner and outer bash guard type thing.
Or SRAM.
The k-edge xl are very good but I still regret spending that much money.
EDIT: like how the product page there says: "tested by Telenet-Fidea". Will probably sell more units than "tested by Crelan–Vastgoedservice".
@Howard started
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So you need a braze on chain keeper? How about this fella
https://www.westbrookcycles.co.uk/k-edge-cyclocross-clamp-on-chain-catcher-single-xl-braze-on-p299810/s494900?
Another option might be an inner and outer bash guard type thing.
Or SRAM.