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True enough. Part of the thought that went through my head was that the day before, I desperately needed a tubeless repair kit and the only one I could get my hands on was £40. Having felt angry enough with the shit tyre failure (excuse the pun) I'd vaguely decided I would not tubeless again, with that I was conceiving returning the repair kit for a refund. Couldn't do that if I had used it, even worse, used it, it failed, and used a tube and still down another £40 plus the ~£40 dead tyre.
CSB.
At worst you'll have to stick in a tube anyway and you've tried them out.
If you can fix from the outside it means you keep the tyre seated, don't lose (as much) sealant, don't need to use a tube (which might flat further along anyway) and don't cover everything in jizz.
I really should've used my old Horizons to hack a big cut in and see how effective multiple anchovies and/or dynaplugs were - then I'd at least have experience without being out in the field (literally).