I have one of his gold bar sights on sights on my 45. But I had him do a full custom job on it. He also installed the Bowen rear. It's a great set up. Sad to hear he isnt doing them any more.
I'd send it to Bowen's shop and have him do the front a rear at the same time.
I had a guy work on a 45 ACP a time ago and he said that before he'd do any serious internal work, he recommended getting the best sights I could afford. He stated, "without them, the rest of the gun is just a lead slinger, no way to tell accuracy at all !" I have come to appreciate his wisdom.
FWIW