Yes indeed. That would be an excellent solution.
However, even though we can generally get these headsets out to people within 48 hours to most parts of Canada, it might be more difficult on weekends or when people live in more remote areas, for example.
And this only happens once the witness's attendance has been confirmed. The committee has to have decided which witnesses it wants to hear. Then it has to contact them to confirm their presence and obtain their address so that we can send the headset. This might take a few days. After that, some tests have to be carried out.
All in all, the process might take up to a week, and as you mentioned earlier, in most instances the advance notification period for witnesses is much shorter.