NW diver we accept the risk of hypo/hyperoxic gas every single time we blend nitrox, trimix, or dive a rebreather.
Yes it's a procedure that needs following but it's not exactly insurmountable.
N2 contaminated? It's exactly the same level of risk as the oxy or helium being contaminated, which we all take as a completely acceptable risk. And very probably much lower risk than the risk of a compressor filter failure.*
*which happen, regularly. Remember the recent one about the pool full of scouts getting gassed with monoxide and needing treatment? When was the last time we heard of contaminated helium? Ever?
Yes fine this method is not going to be universally accepted or convenient, but ffs let's not go making up safety issues off the top of our heads without a dose of realism about it.