I've used tyre weld a couple of times
first time was a few years ago with not good results
the tyre weld came out of every spoke hole as fast as i put it in.
ended up riding home 5 miles on a flat.

second time a mate had a flat miles from home, picked up a tin from a car spares shop put it in and it work just like it says on the tin. probably worked because we started to tape over the spokes with insulating tape instead of using rim tape.

As a a get me home fix it's worth a try, but have a back up plan.