I had this recently with a Black Chilli RQ – most annoying. I patched it with a large tube patch, covered with a strip of stretchy latex that I’ve been using for exercising my new shoulder as part of my physio, glued on top with some vulcanising solution. On top of that I applied a strip of Gaffer Tape, so it’s a belt and braces fix.
I’m running it tubeless…gulp…
BTW – I have a friend who works in the -ahem- adult fashion industry and she’s given me a few tips on bonding latex. Remember to think of the direction of stretch, think of the forces being applied to the tyre as it stretches and flexes. Glued latex needs a lot of contact area to ensure the integrity of the join. Apparently Bostick do a specialist rubber cement that can be bought in industrial quantities that’s good for this, but otherwise ordinary vulcanising cement will do.