So, if keying the entirety of The Maddening Corridors of Nuclear Chaos is not really a viable option, what can we do with it?
Well, we can cut it up and use a part of it as a complete dungeon!
I divided up The Maddening Corridors map into 36 quadrants, took a random one (by rolling two six-siders), cut it into half, edited out some errant corridors and superfluous exits; and ended up with a 60-ish room dungeon.
The next step of the exercise was to key it. I followed the basic procedure of my two previous OD&D efforts (Temple of the Berserkers and Outpost of Stone & Silver): stocked it quickly using Delving Deeper (made even quicker through Inspiration Pad Pro automation), then edited as needed...
You can fit 61 rooms on a single page... Of course, the key becomes very minimal, but still, I think this is playable. See for yourselves:
Download PDF with map & key!