I was mostly replying about the removal via hot potatoes as mentioned after you said to trim. I can file them... That makes sense. I do have a 7 month old cockerel that has very pointy spurs, not long - but pointy. He's not the one mating the hen in question - at least I'm pretty sure it's not him, as he is kind of an outcast and doesn't get much in terms of girlsYou can trim the spurs and still show can't you? The reason for this (no removal) may be that someone might try to claim that their cock bird is a cockerel. It takes all types!
On my Buckeye, I only took the points off his spurs and on one of his legs he has two spurs! That was fun. On my Andalusian who had spurs almost 3 inches long, I took off about a half inch and just squared the things off so they couldn't cut any hens. You can still tell by the size of what is left that he is not a cockerel.
Generally, on a cockerel, the spurs are blunt. But when they've reached one year or almost one year, a little needle point will start to grow on them. You could take a file to that point if they are developing. I used a workshop file for mine... big enough to handle the job.However, a nail file would probably work for cockerel's developing spurs!

I have a cock that has a spur on the outside of his leg! Not the inside! How weird.. lol Never saw that before.