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+1 for worm : Usually a worm + rubberised superglue works nicely, and avoid having to remove the tyre and messing with sealant..
Regarding paches, I've used a hutchinson "rep'air" road tubeless patch to fix a leaking fusion 5 galactik tyre (tyre worm would not even stay in the hole...) : It's been holding for a while now, and look safer than a worm fix, so I guess you could try.
Btw, I'm not sure how different are these patches from regular one - maybe different rubber compound ? the kit glue is the same as the one in their tube patch kit.
Any forum recommended patches (is this even the best approach) for fixing inside a horrible gash on my g one speed?
Tried rubberised superglue which didn't fix it and kept leaking air; before I go through a whole bottle of cafelatex or buy a new tyre (which would be shit as it's not old) thought I'd see if a patch on the interior would work.