A friend did it this way, I'm gonna try it if the rear site filing ain't enough...
If you didn't want to go through the work involved with cutting the barrel for a dovetailed site, you could consider silver soldering a brass cone, which I did with my '62 Pocket Police.
I took a piece of brass welding rod about 3" long and hollowed out a cone shaped recess in one end with a cone shaped Dremel mill bit.
That recess conformed pretty much to receive the small factory cone bead on the barrel. I ground the new site into a rough cone, but left it attached to the 3" piece of brass rod (so I could hold it better), then cut it off once it was soldered in place. I heated the factory sight for soldering with a small, focused butane torch, so as not to damage the bluing, then before final shaping with fine files, I wrapped around the barrel/new sight with masking tape so as not to scratch the barrel.
It worked pretty good. The new sight is solid, and its height , combined with filing a deeper notch in the hammer rear sight,.... has really helped it shoot more to point of aim.