You can take this approach: remove IBM jacks from both ends of a cable run. Before doing that, check whether the installers left any slack for re-termination. If not, pick another cable.
Then terminate just regular shielded RJ45 keystone (or any other type) jack with 110-type impact tool so that pair #1 goes to pins 3 and 6 and pair #2 goes to pins 1 and 2. Thus you'll serve the pins needed for Ethernet connection.
Pay attention when terminating the RJ45 jacks. IBM type 1 uses 22 AWG wires, so you usually cannot re-use the jack, made for 24 AWG, if you made a mistake.
You would have to think about a way to mount the jacks at both ends. Sorry, I cannot be more helpful without knowing what type of faceplate/gang box at the work space and patch panel or jack panel at the telecom closet side.
Dmitri Abaimov, RCDD