That sounds like a much easier way than how I've been doing it. I'll give that a go for sure, at least I won't have to worry as much about rubbing through that way
The de-nibbers that Hi Ryder is talking about are fantastic. More consistent than a razor blade because they're thicker material. Worth the cash too if you're using them frequently. Really handy for dust nibs. Looks similar to this one That said, I'll generally just sand minor runs with a 30mm block.