When it comes to the possibility of a mask, what you really need to be looking for is an ANESTHESIA mask. The others are only meant to supplement oxygen, whereas in an anesthesia setting, the entire respiratory system, including the tubing and machine, is considered a circuit, so keeping a good seal and preventing leaks is important, hence the reason they usually intubate. But in the cases where they do use a mask, there is a strap (see attached pictures) specially designed to hold the mask on the face and maintain a seal. The pegs on the mask are designed to work with this strap, and vice versa. That takes care of the seal, the only thing left is a reservoir to handle the tidal volume (breathing in and out.) On an anesthesia machine, this is normally the green or blue rubber "punching bag" you normally see. The device I pictured with the tubing would meet this need, and it also fits anesthesia masks. All three of these together should theoretically work like you're wanting.
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