Helmet INT benefits all mages. Helmet LUK will allow luk mages to require less luk to equip their gears. One of the reasons why higher leveled wands/staffs aren't used is because their attack speed is slow to normal. Evil wings and pyogo mushroom (currently not confirmed to be out) are the only viable options due to their fast attack speed which is especially noticeable on mages. Additionally, nocturnal staff and lama staff are readily accessible by the community making people lean towards making lukless mages. The difference in ~6-10 extra mp per level is not a huge difference in making people choose luk vs lukless. Perhaps changing attack speed of higher leveled weapons or buffing their base magic attack is a better solution than not implementing Helmet INT into the game to encourage people to choose LUK mage.
I also agree that these new scrolls should be implemented in a way to make less popular maps useful. Perhaps removing or reducing the drop rates from leafre mobs (similar to wolf spiders) and adding it to deep ludi, KFT, deep sleepywood or aqua mobs. Adding these to OPQ is also a good option as it is a difficult PQ which needs a buff in their rewards. Another option would be to add the 60% to the BMM quest and perhaps have the 10% available through another daily quest (maybe pianus).