It would work. The only sticky parts would be:
1. The wireing (relativley easy unless the 86 is FI) - reverse lights, and 4WD indicators are backwards.
2. The linkage (also relatively easy - it's the reverse of the 5 speed EA81 swap). It can be made to look stock by shortening the 4WD lever by about 1" and mounting the back portion of the 5 speed's "linkage tray" where the pivot for the 4WD lever is located directlt to the underside (fabrication again, but not real difficult).
3. The transmission cross-member (have to fab something as it will be completely different - medium difficulty - you can look at my write up on using 5 speed mounts on my EA81 for ideas [not the same though] -
http://home.comcast....eed_mounts.html).
4. Exhaust hanger bracket (little welding - not much problem - doesn't have to be pretty, so I'll say this is an "easy")
5. Clutch will have to be the EA82 flywheel resurfaced to the EA81 pressure plate step, EA81 pressure plate, and EA81 disc. OR you could use the EA82 pressure plate, EA81 disc, and fit a Nissan 720 truck release bearing to the EA81 bearing holder - so you have options.
6. Use the 4 speed single peice driveline.
GD