As Busted has implied, one of the advantages of a diesel is its ability to keep moving in spite of a charging system failure. Replacing the mechanical fan with an electrical one negates that advantage.

It's also worth remembering that the mechanical and electrical fans serve as backups for each other (even though not really designed to do that). Should the mechanical clutch fail in such a way as to disable the fan completely (does that ever really happen?), the electrical fan will operate when the coolant temp gets high enough. If on the road in a remote area, one could always hot-wire the electric to stay on all the time. That would provide enough cooling to get you back to civilization.

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"Buster" in the '95

Our all-Diesel family
1996 E300D (W210) . .343,000 miles Wife's car
2005 E320 CDI . . 148,000 miles My car
Santa Rosa population 177,300 (2026 projected)
Total. . . . . . . . . . . . 668,300
"Oh lord won't you buy me a Mercedes Benz."
-- Janis Joplin, October 1, 1970