I would like to think there's a way they could allow multiple Adloquium effects to stack, since from what I've noticed Adlo stacks with Stoneskin in a way that the shield from Adlo/Succor will absorb damage before Stoneskin will (this priority is likely because of the relative duration of each buff).

I wouldn't mind if Adloquium effects simply converted to raw healing without the caveat of having another scholar putting the existing shield on first. As was pointed out, at that point it's only slightly lower potency than a Cure 2 and even stronger if the critical bonus is kept intact.