Consider adding an entry to the Lexham Bible Dictionary on the Mesopotamian apkallu, complete with the most up-to-date bibliography (which would be the main pay-off). I searched my entire library and the store by headword and the only resource with an entry is the DDD.
Then of course the next logical step would be to create a Factbook entry for the apkallu. And people could then tag their resources that refer to the apkallu with Factbook tags.