We are here to increase strength which is a function of how much force you can produce which is a function of how much weight is on the bar.
Would your protocol work? Probably. For a while at least. You are afterall a novice so a great many things will still work. But your desire to "reduce risk" is misplaced. First of all weight training is one of the safest athletic endeavors you could pursue (Hamil, et al). At the weights you and I and non genetic freak types are handling increased risk is more a function of movement quality than it is absolute load on the bar. In other words you can royally fuck your back with 135 if you bend over and twist the the damn thing just as easily (and probably more so) as you can pulling 550 (if you are even capable of doing so).
Basically as it has been said many times: "Just do the program". Trust us it works.