I understand the idea. I guess the need for metrics (measured changes) makes sense as you are learning your rig. Everything is new and one wants to be able to repeat specific steps that gives you success and limits failure. This feels like a lot of work for little reward. When you get on the boat and start practicing with the rig I think you will get a feel for what is driving the boat successfully and what is a waste of your time. Pulling your backstay exactly 2 or 3 inches will quickly become needlessly tedious. Pulling the back stay from 2 points and then having too readjust after a tack will be lost and you will not be making many backstay (during your race) adjustments as the mainsheet, tiller and traveler will become the primary tools.I agree it is Rube Goldberg
Sure you'll adjust the backstay... In tight when going to weather (checking the forestay and the mainsail) and released when going downwind.
If you win races doing this you'll be happy. If you are neck and neck you'll be looking for every advantage.
I think you'll find that your wins will be based on a lot of other things, not your backstay 1" measurements. More likely it will be the number of practice sailing sessions you have with your crew and a coach watching your performance. The experience you have in the sailing conditions you race. The accuracy you use in the course and tactics applied. The understanding of your competition and how they are racing their boat. The way you maintain your boat in proper racing condition.