The problem is format, really, not the transmission type. It would be like playing an Xbone game on a PS4, despite them both being outwardly similar, for instance.
Freespacers being freespacers have worked out how to emulate Neko brains and access the SYNC, so Arccos could technically show herself to Akemi if she wanted to, but I don't think it works the same in reverse. If a real Neko brain was attached to the polysentience it would probably be immediately hacked by dozens of syntelligences billions of miles away. If not Arccos herself.
So... Yeah, it's probably better off this way. >_>