I tried dremeling them a bit, and maybe it's just my inexperience with it, but it's harder than it seems. First, it's very slow to do, second, I ended up making one of them a bit too loose since it's hard to make sure that you are dremeling the cruciform wider evenly rather than just in one direction, and third, the bit I was using broke, so that brought an end to that. So I just ended up forcing them on and it's pretty obvious that they're never going to come off.
That's okay with me however as I don't intend to change them and they do look pretty cool. I'll upload a picture a bit later. I bought a full set which covers everything except the spacebar and the enter key (he has an enter available but it hasn't shipped yet). I haven't put on a few of the keys because I have to do something first before I put them on and lose the ability to take them off.