Go for the repair, it'll be ok.
Tyre manufacturers have to say that they don't recommend repairs, just in case someone falls off and dies horribly, and their relatives sue for millions.
I've had repairs done that last for the life of the tyre, and the old rule of thumb is that you'll get a nail in a tyre before it's a month old.
None of my relatives got a penny.
Now let's see, if a company sells tyres, and tells you that whenever there's a puncture you need a new tyre, who might benefit?
Answers on a postcard to:
Self-interest@megacorp.co.uk
BTW, used one of the above Rema plugs on a rear tyre which only had two weeks to go before being thrashed to death on the drag strip at the Bulldog Bash year before last.
It not only did the commute for the two weeks, but got me to the Bash loaded with all the camping stuff and did the drag strip runs (including warm-up burnouts) without a whimper.
No pressure drop, nothing.
It's not falling off, it's an upgrade opportunity.