I suspect that Angie, who is a always very friendly and very helpful, didn't fully understand the question. Bummer. I thought that I had been told at one time that they'd sharpen the swedge for a nominal fee. Oh well. Travis is the man on this sort of thing.
Anyway, sharpening the swedge on a 42 yourself isn't that difficult. I've done several of them with my Gatco Edgemate using the "extra corse" hone to get most of the job done. You will need a sharpening approach with some sort of "extra corse" hone.
If you try to do this with, for example, a Sharpmaker, your arm will fall off before the swedge is nearly sharp (now, of couse, someone is going to post saying that they did theirs with a Sharpmaker and it only took three strokes. Fine. You have a stronger arm that me.)
Another option would be a Dremel Tool. But, you're unlikely to get a really nice, even result with that tool since it's so uncontrolled (now, of course, the same annoying person is going to post that they did theirs with a Dremel and they couldn't find any unevenness with a digital micrometer. Fine. You have a steadier hand than me.)
Another option you might try is a bench grinder. Just be careful not to get the steel to hot. You can easily affect blade temper with a bench grinder.
The only other problem here is that apparently BM feels that sharpening the swedge is a modification to the knife that voids the warranty. Now, the same annoying person is going to whine and complain that this is bogus and just another example of the evil powers at Benchmade trying to suck all the air out of the room. But, if you think about it, you are changing the profile of the blade. It's not a major change, true, but it is a change. If I decided, for example, to fire up my Dremel tool and convert my BM42 into a High Hollow, most folks would realize that I'd really changed the blade profile, really modified the knife, and that BM really doesn't have any obligation to warranty that. The difficult question is, "where do you draw the line?" What's a major change to the profile and what's not? BM prefers to draw that line very early. It's really one of those "if you give one guy an inch, the next guy will suddenly want a mile," things.