Yes, Gemp is AAA.

try the LBS for a new thin wall tube sized S or greater in cross section than your stock

Buy NAPA nit Rema. NAPA may sell use able patch stock but too thick $$

Cut a rectangle of thin wall sized to wrap upwards/inwards of rim so the open rec ends are near spoke holes.

Arrange tools to mount tube in tire on rim.

Glue up, mount tube tire n pump.

Is best using a cool room.

Best fir rear tire.

That works PITA.

Buy more t u be s or change riding style.