I got that shifter cap/ring off today. I ended up shining a bright LED flashlight down into the area where the spring is so that I could see the pins and determine why things weren't moving and allowing the cap to come off. There were big chunks of greenish plastic from the destroyed OEM bushing all jammed into everything in there. I was able to use tweezers and Q-tips to remove everything I could see and this helped a bit. I then tried pushing down on it while looking at the pins to see if it was going down all the way, and it wasn't. I took a big flathead screwdriver and pressed down as hard as I could on one side of the ring and then while doing that hit the but of the screwdriver pretty hard a few times with the hammer until it went down further. I did this on both sides and it freed up the ring so that I could push it down further and spin it off. The entire bushing was completely gone and ground up into chunks that were getting in the way and preventing me from pushing down on the cap/ring all the way.
I cleaned everything out and am now waiting for the new seat to arrive from Marlin Crawler.
I also have a new cap/ring that I bought from Toyota in case I needed it. My original one is a little banged up from removing it, but I'm not sure how exactly to get the neck of the shift lever off of the bottom piece of it so I can replace it. Any ideas? I tried twisting it and it didn't budge. I don't want to break it in the process of trying to replace that cap, since I technically don't really have to replace it but figured I would since I already have the part anyways.