OK, I haven't read the whole thread so I hope someone hasn't posted this already.
Honestly, OP, you are overthinking this. I get it, you want the perfect overland vehicle. So do we all but that vehicle doesn't exist, never has and never will.
Life is about compromise. Only YOU know what you're willing to compromise on. And really you don't even know because you haven't started. Sounds like your mind's made up about the GX460/470. That's a good vehicle, I drove one in the Middle East (where it was called a Land Cruiser Prado) and it was a great vehicle. Very thirsty but fuel was cheap in Kuwait and besides, one of my relatives (my Uncle Sam) was paying for it anyway.
Everybody travels/off-roads/overlands differently. The things that work for someone else may or may not work for you.
So the FIRST "recommendation" I'd make is: ignore everyone's "recommendations" about what you "need." One person will tell you that you NEED 35" tires or skid plates or limb risers. Another will tell you you NEED a winch, a set of max-tracks, and a HAM radio. But do you?
People have driven hundreds of millions of off-road miles without any of that stuff. 99.9% of the off road vehicles you encounter in the US don't have any of that.
Start with something simple and basic, and just get out there. As you do more, you will come to know what you "need" and what you don't.