That would be ideal, but is it too much to ask for what is...

That would be ideal, but is it too much to ask for what is essentially a spray nozzle and a pump? It's no more complicated than the water-meth injection system fitted on my car and programmed to match the air-fuel ratio. It injects water-meth into my intake instead of Natshield through a HVAC system. When it's running low it lets me know and I fill it up again.

I'd love to see Australian Standards to that effect introduced, but first we need TGA results back before we start thinking that far ahead. A huge proportion of the population is not eligible for vaccination, such as under 16 years old and people with certain medical complications, so the need for safer buildings will remain relevant for a long time yet. But, HCT need to show they will be relevant in that space very soon.