Funny enough... if there is someone between them that can handle toddlers is Clara, not because she is almost a toddler herself(sometimes XD)... but because she is a big sister.
I think that sowing more independence from the youngest generation onwards is a good method to do this job they were given.
Cutting away bad societal habits is... EXTREMELY... complicated (which brings the fairness of this job chosen by Mephisto, but let's not go there), but fortunately it doesn't seem they have to contend with the older generation as they seem cooperative if somewhat timid, so if they can start by cultivating the talents of the children things may develop from there.
But... I don't think the Many-ears just buckled down in one generation to the societal pressure, unfortunately... they clearly have some natural disadvantages compared to other devil races, and they already made some niche places for themselves in society (even if very limited) so this must be kept in mind, as the solution may prove to be of a emotional roots than a practical one... but the practical will be a obstacle.
I am curious if there will be... outside interference.
Mephisto being in charge of this project may be just the "right of the 13 crowns", or it could be that there are political waves going around.