If the issue is removing the synchronizer ring, from your picture it looks like the outer race of the rear countershaft bearing is still in place. The StarQuester removed both front and rear. That must have given him enough room to displace the countershaft and wiggle out the ring. If that doesn't do it, remove the main shaft center bearing.
Here's a video of someone disassembling a Ford FM145 which has Mitsubishi internals and the steps look much the same. Skip the first 20 min to jump to the relevant portion. He uses hammers to remove some bearings. Not sure that's wisest with an aluminum case.
https://www.therangerstation.com/for...-video.196355/
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