On my 87 2.5, the air conditioning compressor pully bearings are getting worn, i think. Every now and then at idle it will produce a raspy sound. The A/C blows warm and I'm the third owner of the car so it could be anything wrong with the system (also never been converted to R-134a). I'm not really intersted in reviving the A/C at this time.
I have to change my belt tensioner soon and I'm thinking about just bypassing the compressor for now.Here's my question:

Will it be okay to bypass the compressor and still use the A/C controls to manually turn on my radiator fan if needed on hot summer traffic days?

I think so, but I'd better bump this for the A/C experts to see.

Been doing this on my '85 duke. A/C relay is out and the belt is off the compressor pulley. I don't see what could be the problem.

Yes.
Just use non AC belt.
See my Cave, Serpent Belt

Many AC clutch pulley bearing are worn and cause serpent belt to fail. How fast depend how bad the bearing is because three pulleys are very close together.

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Dr. Ian Malcolm: Yeah, but your scientists were so preoccupied with whether or not they could, they didn't stop to think if they should.
(Jurassic Park)

The Ogre's Fiero Cave (It's also at the top and bottom of every forum page...)