I am not terribly impressed with Ofmega's metallurgy. I have a low flange hub shell that had a section disintegrate. The evidence is anecdotal, but it has become an opinion in my brain.

Look into Sakae cranks. You might find something that looks appropriate. A good deal of what they made were knock-offs, but the quality was good and the prices are reasonable.

The Mistrals were 144 BCD, and I've seen a few with the rare 41 tooth ring, so check for that. I'd go for Campy NR/SR. Too bad the bike didn't come with the pink Mistral RD.

Thanks! A forum member has hooked me up with a DA crankset, so I'll be set in a few days!

That is sweet! Great deal. That would be a keeper for me!!

Well, I was going to put a temporary crank on it last night and take it for a spin, but after I got the crank off and bottom bracket out, I decided to go ahead and just strip it down (because knowing me, I would have procrastinated doing it and it would never get done). Seems like it was originally taken care of, but has fallen into neglect for sure. There's a little more rust evident now with most everything stripped off. The stem is stuck. The stem bolt wouldn't budge, then stripped really fast. Took a closer look and there was a crack in the bolt head. Ended up drilling it out with no problems. I can wiggle the stem back and forth, but cannot get it out. I flipped it upside down, covered the hole and pretty much filled the headtube with Kroil. I'll let it sit a few days and have another go.
It definitely needs an Oxalic Acid or Evapo Rust bath

I think we all have had one of these projects that you get so much time invested that you have to complete it somehow. Mine was a Burley tandem that very thing seemed to be stuck or stripped on and took over a year to make right. I hope your project goes better.