Don't you just love auto correction sometimes?!?!?!
As to your question....I would assume some companies would be able to do it, but not certain it's a DIY job unless you have good soldering skills.
Taking the ECU apart is a daunting task, as not getting it back together and sealed again means it will last maybe 3 months!
You must be right on the edge, as both my 2000 vans have had the newer ECU.