At that point they may as well just make it passive generation, at once per 20 seconds, with progress paused during DWT.
Though I've no idea why you'd want that. It'd take a huge network of reworks such that you're allowing your pet to cast (what allows you to cast (what allows your pet to cast)) what allows you to proc an Aetherflow stack such that passive generation feels at all rewarding or cohesive.