when crimping hard on positive edges, skin pain can be an issue. a tougher skin could help.
if this is not your case, I'd suggest to boulder on crimpy stuff if you don't want to fingerboard.
I think, though, that fingerboarding is safer to train crimps and fingers in general, because when climbing you are never sure to get a hold perfectly, your fingers can have very different loads and angles due to the shape of the holds, and if you really want to complete the problem (like on rock) injury can be a result.
on the fingerboard you are sure your fingers get an even load, and you can progressively increase the effort with less risk (unless you start doing pull ups).