[ He certainly sounds willing and interested in the task, moreso than many others would be. Considering he's a demon, of all things, Howl isn't surprised either.

There is one other relevant lead he ought to mention... ]

One place you could start both investigating and the persuading itself are the occasional meetings that take place between Kenoma and Pleroma leadership. A handful of Aions from both sides are sometimes invited as well. I am unsure if relations will allow for such meetins to continue, considering events of late, but past participants could tell you about what was said there. Emet-Selch and Ciel, the two who prompted this large discussion of ours, would be the people to ask first.

[ sorry to send yet another person your way, grandpa. in ciel's case, sorry not sorry ]