Advice on saving a sliced new tyre

Put a new tyre on a couple of weeks ago (gaterskin 25mm) and must have hit something really sharp as its sliced all the way through. I don't want to throw it away but it's unrideable. Any advice on patching it up? I was going to just put a load of innertube patch glue in the slice and try and get it to seal and maybe put a tubeless patch on the inside

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