I have never tried it myself but have heard it suggested that the proper sized 12-point socket actually fits the bushing quite well and if this is true, a socket would also push down the pin nicely. If it were my pistol, I would squirt some Kano Kroil in there, let it sit for a day and then carefully attempt to loosen that bushing.
I personally believe the original 52 bushing "wrench" was a genuine mistake/oversight by Smith & Wesson. Here you have a legendary pistol that represents the full ability of S&W and the "wrench" is stamped sheet metal junk.
Reminds me of an oil filter wrench. The only time you ever need to put a wrench on an oil filter is when some previous FOOL torqued it down as if it were a load-bearing fitting.
An oil filter should be hand tight or less, and the 52 bushing is the same way.
The OEM bushing wrench for the 52 is scrap metal and simply doesn't even approach the elite and beautiful Model 52.