The bolt and nuts method would work fine if you can remove the shift lever from the tranny. Many have done so. If someone takes photos and details how to do so, that would help. I briefly looked, but didn't see how. There may be just enough room to get the bolts & nuts up to the bottom of the shifter (rear bushing, I think impossible at front bushing). If not, you would have to unbolt it from the car, which you must do anyway if changing its slide bushings.

I can't really tell a difference between my KTC tool and the one on PeachParts. Might be from the same factory. I paid a bit less. Mine does seem to work fine after I added the washer backer. I watched the MS youtube video again, and noticed that his bushing also sits very loose on the post of the tool. Ken says to use silicone grease to hold it on. The car he is working on has more space. I think he dropped the transmission down a bit.