After removing that pin, just tap the front sight back and forth with a lite hammer and a piece of 1/2" wood dowel for a drift. Even if they used blue Loctite - like I do - that should break the bond.
The proper height HiViz is their #SW617 - uses the stock rear sight blade. I got mine from Brownell's - but it was drop-shipped from HiViz, so you may want to cut the middle guy out - same price. Below you'll see it on my 617 - and a replacement on my 5" 63, which illustrates another measurement to be aware of - OAL - it hangs off the back of the ramp slightly!
The new 3" 63 on the bottom above also has a short height HiViz - and shorter OAL, too. It wasn't available as a spare part (... for my 60 Pro!) from S&W the last time I called.
Stainz
PS Neat mod for the .22 plinkers - especially for my 'mature' eyes.