My hat's off to you Miles. That's a really, really sweet looking gun that would do great down in So Cal as well if and when the water and weather ever clear.
The Yakooji's now made for Hawaii Skin Diver are very nicely put together with top drawer componants. Short of building your own or shelling out the real ducats for a vey custom gun from Kitto, Merlo, me

or Mori, they are the way to go. I'd opt for a Wong if not a Yakooji.
On the Alexander handle, you can wrap it with grip tape for that little extra and if your mitts are too large for it, gimme a ring and I'll swap you a Wong/Aimrite.