well, if this console is on the latest, then you wouldn't be able to downgrade in the first place. Unless you plan on using these features, and as long as his console is on a firmware where HANS does not work, then you would be right. However, he is on 10.3, so as long as HANS works on that firmware, and he is playing cartridges, you don't need it at this time for this situation. all you would need is to install menuhax through browserhax so you can run HBL.
You guys really need to evaluate the situation before you shove A9LH down everyone's throat to even decide if it is the quickest most time efficient solution that fulfills his requirements.