It kind of came and went as a side discussion, but RE: Communicating with Witches: Umika's Ex Fille is capable of reading the thoughts and emotions of a demi-witch that's otherwise unable to communicate, and Satomi's animal communication is capable of, well, communicating with animals (most of whom aren't sapient/sentient and can't otherwise communicate effectively with humans). Neither of them are read in on Witches, but Sayaka is, and she has copies of both of their powers-- The only two Pleiades she didn't copy were Niko (Matter Reconstruction) and Mirai (Bear Summoning). Using those in concert (especially if we have Niko use her technomantic expertise to combine them into a Seed Communication Device), we might be able to break through to a Clear Seed that's become active through exposure to (and thus, permeable to certain kinds of) magic, such as Aurora or Arzt Kochen.
Now that I've thought of it, I 100% want to do this the moment we have an open spot in the schedule. Even if it's entirely one-way communication from the Seed to us, it would be a massive breakthrough on the road to dewitching, and give us the additional leads we need to break into either Soul Gem restoration or reembodiment. If we can test and prove the theory, this is how we get Airi completely on our side fucking instantly.