Tracking intermittent work like this is really tough. What I’ve done with the Special Ops guys I work with when on tactical training days or missions is to wear the HR/GPS monitor for the full duration. Then make the best guess as to whether you need to use a fudge factor for elevation gain, weight of the pack, or somebody shooting at you (just normal shit like that).
Combine this data input with your perception of fatigue from the day’s work. One thing I can say for sure but we can’t put a number on is this:
These days will make you tired but add minimally to overall fitness due to intermittent work. It be like playing 18 holes of golf. You probably get tired from this but it won’t make you a fitter climber.
But you need to track because it adds to the over all training stress and should be accounted for.