I am almost 30, but I'm only 5'0" on a good day, if I stretch a lot before I get out of bed.
I also have the swingarm from the 92, which I have reinstalled before so I know how.(I got the bike in pieces from a friend who had completely disassembled it... I have no idea why.) Assuming that's also a compatible part for swappage, it looks like I can convert the big-wheel version to the non-big-wheel version.
What basically happened, is I posted an ad on craigslist saying I had a beat-up car for sale and was trying to save money to get a bike. I got a reply asking if I'd trade it for a KX80. Well, the offers I was getting on the car were roughly 1/3 of what people were selling 2-stroke 80s for, so it was, financially, a great deal, and I went ahead with it, even though it wasn't exactly the bike I was hoping for. I'm happy with it, for the most part, but some adjustments and tweaks are definitely in order.
Essentially, the former owner is MUCH larger than myself, and the bike setup shows it. Initially, for example, the suspension preload was cranked up so high there was absolutely zero static sag and I could barely move it. I almost couldn't get on it.
The 92 I have is mostly complete except for some engine problems, I have actually considered taking the engine from the 94 and putting it on the 92 (I'm betting it will fit...) but that's a lot more involved than changing wheels and maybe a swingarm. :)