After reading Michael 808's thread I decided to give it a go.
I ordered the XHD30 from Esslinger which was delivered in just a few days. Wasn't sure whether I should or could use the existing Hardlex gasket and would decide once I could examine the fit. The XHD30 was too small [like the Harlex] to use without the gasket but just the ever so slightest bit too large with it. Do I purchase the crystal lift or sand a very small amount round the edge, risking the possibility of ruining the gasket? Decided to trim the plex crystal with Scotchbrite after taping the entire surface except the edge that seats in the case. Using my "McGyver esque" tools I slowly compressed the crystal down till it popped down in place. Leaving the movement out I reinstalled the case back, crown, and bezel. Took the assembly down to the utility tub where I subjected the watch to as much water pressure as possible to all vulnerable areas. Filled the tub and left the watch submerged for a time with no water entry of any kind. Not a certified WR test but more than my most of my watches ever experience. Feeling confident is the WR I reapplied silicone to the seals and did final assembly.
Love the profile.
A perfect match with the Murphy bezel. Together they give this modern watch a classic vibe.
Hi-Dome vs Hardlex.
Thanks to Michael 808 and scdone123 for the inspiration, stevenkelby and bluloo for the additional info.