This is what Steve’s site is all about! I’ve got the concept but the details are yet to be worked out, well, at least for me. At the risk of straining patience and beating a dead horse, the way I was going to start is to determine whether I had a continuous source of consistent light, if so, shut off auto ISO and switch to single point exposure, consider my targets color/brightness and speed, anticipate the backgrounds I’ll be shooting against (color/brightness, and distance). Then assuming my subject will be a BIF , then first estimate the highest ISO I could accept, as a starting point only , set my aperture where I think I’d like it, measure off a med gray, black or white object and set shutter speed accordingly. Test shoot, adjust any of the three values (which ever is most important to the shot) until I had the right exposure based on the histogram not the meter. Then, as suggested, if I want to change any setting I’d just need to compensate (do the opposite) with any other setting to balance. Sounds ridiculously hard, but will actually be very easy once I’ve got it locked in my brain and muscle memory. Then if not a BIF but a portrait my initial consideration would be how slow not fast an ISO can I stand and what aperture would I want then shutter speed would just follow. If this works out, next concern in either case is will my subject be mid gray, brighter or darker, and experience will tell me to adjust up or down the one setting least important to the shot to compensate and lock the exposure for the photo. If this is too crazy, just ignore it, and I’ll pull it together in the field, maybe!