I've been aware of the NetVista 'Space Saver' keyboards IBM manufactured as their last series of desktop-trackpoint keyboards with space saving capabilities. Typically used in server racks --or-- for cramped desk users or point of sale/retail type situations.
Finally got around to picking one up--while a little pricey I guess, I still wanted it for science and investigation purposes. It pairs with the IBM mini quite well, which is slated for a copy of OS/2 since, its old socket 487 prescott isn't good for much else, I did install ultra-low-latency OCZ DDR1 modules totalling to a whopping 2 GB of RAM. The NetVista Space Saver uses a standard width trackpoint stem as found on IBM's last run of ThinkPads (which means you can put a soft rim cap on it), I have and boy oh boy does the soft rim stick out quite high, but strangely doesn't impede typing. Pictured here it's just using the old cat's tongue: