Even thought I dont completely agree the rep/set thinking behind this, I think this is decent movement selection.
For linear progression: program only movements 1 and 2, and do rest just by feel.
Do one big lift per training day (sqt, bench, dl, press for ex.) and dont kill you self with the weights! (Start with easy weights, first couple weeks should not be very hard).
Yeah Heavy main lift, then high reps for assistance is as tried and true as it gets. Once in a while can even play around and go very high reps for the final move 5x20, 2x30-50, 100 rep finisher etc
I alredy do that, i made a push pull leg split for myself where i built the entire routine around squat bench and deadlift(i cant do much yet for ohp because of past injuries).
Im also thinking about time management changes. For example yesterday i was in the gym doing squats and i got a phone call i needed to hurry, so i googled squat finishers it led me to 20 rep squat challange…well it was probably the best leg workout i had in months even tho all i did was 1 heavy set of squats.