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This may not work as I intend (and may also not help you either) but I've ordered a cheap one of these from eBay:
https://www.infinitecycles.com/product/minoura-sbh-300-saddle-mount-bottle-cage-holder-301196-1.htm
I'm hoping I can bend the mounts out slightly to act as a makeshift anti-sway device but also give the option of extra bottle holders if needed.
Maybe something like this could work as a light mount?
whats the best way to mount this light on revelate visacacha?