Lynne is now using a Petzl MYO-XP. This was the runner-up to Apex in my original assessment.
It has many good features, and overall light-output performance is similar to Apex. My original assessment guessed that it might not be as robust as Apex, but in view of all our problems this was probably a misjudgement.
My previous MYO-5 was always 100% reliable, including any water abuse. Let’s see how this Petzl goes.