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I wonder if just the rim tape would work on its own? It's pretty tough. Never thought of that until now (probably because I don't carry a fucking role of rim tape on my rides - should've done - would've saved me a day on my TransAm)
hippy-
Have done that before with double or triple layers, when I say rim tape, hockey tape works just as well.
This is usually at bike polo pick-ups or tournaments and a bodge is required (not for me) for the many ill equipped players.
Have used as a tyre boot - fiver both new and old, crisp packet, back of a puncture patch wrapped in crisp packet, sidewall of a worn tyre.
Top tip, as silly as it sounds, sewing the hole/ripped bit works pretty darn well, if it is on the threaded section and you're running slicks a slight slit to enable the thread to sit below works wonder before you boot it up from the inside.
coventry_eagle
I've used rolled up crisp packets and they lasted for ages, that's me risking it for the fun of pushing the limits but if I'll have to have a permanent fix, I'll cut a sidewall off a used tyre (GP5000 is my favourite) and tape it on with some rim tape.