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Repaired several holes with just normal patches and glue. Clean, Sand, glue (let cure for a bit till sticky), patch, let dry well, mount, pump to pressure and let sit overnight to see if it holds pressure, then add sealant.
If the hole won't hold a plug (or 2 or 3), it might be a bit large for a patch alone, you might consider a couple of stitches of nylon thread and/or a dab of rubberized loctite to weld the hole before patching it.
Was able to fix a very large nasty cut like that, which held till the end of life of the tyre.
Patching the inside of a tubeless tyre that wont hold a plug . Whats the best technique with one of those velox expensive repair kits ?.