I’m also a big fan of that G45. I had one adapted to M but the job was not done as well as I’d hoped, the lens was never the same gem it was before the conversion. Had trouble with the aperture ring when it came back and that was fixed, but the focus was never very smooth. Unfortunately cannot remember for sure who did the conversion, tho I believe it was done through Japan Exposures when they were still doing them.
The Pentax 43/1.9 LTM is a magnificent lens. I’ve had three of them come through over the years. Never shot one on digital iirc, but loved it with HP5+ especially.