Chassisworks web page (http://www.cachassisworks.com/) now has a double adjustable shock available. Looks like the QA-1 / Hal shock, but what do I know. Wow, quick compression and rebound adjustments! Expensive, but atleast it's out there as an OEM bolt-in replacement.

It ought to remind you of the Hal - it was designed and built for Chassisworks by Hal Lees.

The very same HAL as in the QA-1/Hal shock