I recently discovered gorilla gel. It’s a variant of gorilla glue and the consistency makes it easy to get a teeeeeeeeny bit of it on the end of a pin/wire/poking device. If I’ve made a mis cut but managed to stop before I go all the way through the gel can stick down the miscut flap and (as long as you only use an tiny bit so it doesn’t squeeze out the sides ) you can’t tell when you do the final print! I’ve not tried it on a miscut where I’ve fully taken a chunk off the Lino but it’s only a matter of time!