At my co-op that I work at, we recently got in a nice enough Campy rim with 105 hub. Only issue was that once the wheel was trued up, there was too much tension on one side and nearly slack spokes on the other.

So I figured the rim was toast and broke it down to save the parts (we like to recycle good stainless spokes). Once the rim was naked, I put it up to a window and it wasn't bent too bad, about an inch worth of bend. I then bent it back straight as much as possible. The end result is a Campy rim that actually is nearly flat when placed on the window. There is now about 2mm worth of gap at the worst part of the bend when placed on the window.

I imagine that the rim will be plenty usable and true out just fine once built up.

Delace it and see how bad the rim is when placed on a flat surface.