I know this is an old thread, but I haven't seen it mentioned yet, so here goes.
There is talks from Trail Tailor building a remote mount turbo kit for the 100 series. I'm not sure how much info I can release, but if you're interested, I suggest emailing them.
There is also someone on the Facebook group "Land Cruiser/LX470 100 series USA" that had polled interest for Magnuson to bring back the supercharger kit. However, there is no info on this and probably won't until November. Even then I'm not exactly sure if this will go through. I'm including a screenshot of the beginning of the topic for those who want to follow it.
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That is definitely tempting. I was recently very close to selling my 2006 100, as well as a car I have, and getting a 200 series but I kept looking at my 100 and I just like it too much to part with. I prefer the looks and although mine has some cosmetic issue due to a careless prior owner, its still something I love. I was considering supercharging the 200, since I'd have the money from two auto sales, so a supercharger for the 4.7L would be fun too - I already have headers and aftermarket exhaust. But with 214K miles on a 14 year old vehicle, I struggle to make that make sense. I did fine DAP Tuning and thought about driving it up there for a custom tune - https://daptuning.com/tuning .