The best way to get a working vertical shutter release is with the MK-1 Firing Rate Converter, as seen on one of my F-3's HERE, fitted with a DA-2 Action Finder as well.
Using a DE-2 does shave a bit of weight off, and sometimes I do prefer the lower profile, lighter weight while only slightly altering the finder's image. I do use glasses, and the DE-3 is nice, the P body DE-5 is the same view.