I've had a few of the Ikelite meters crap out on me here, not mine but belonging to camera equipped divers etc. IMHO not very rugged and prone to failure.
Do you have an outlet for the Sekonics? I done a search a while back but could only find the odd one for private sale etc.
Learning Question: Seeing as the ASA value is accessible to the shooter wouldn't that then be set in accordance with the either the ambient / available light or to determine the 'look' of a required sequence?
What is the securing mechanism of your ACL housings port(s)? Shame its not bayonet to allow the SWP44 eh? I also have the Century HD .8 converter as I was also thinking of potentially using that. My mind may be on the right path after all.
I'll be interested to hear how your initial tests go.
P.S I'm also looking to strap, clip, weld or bugger together some kind of color chart to one of my fins. I do have a WB slate on an articulated arm for my Z1 so I may take that idea and add a color slate to the reverse side. WB in 2k and less and Color Reference to boot.