Maybe there should be a "compulsory" rescue pack that people could purchase for a small fee. This would contain a survival bag, Whistle, Lightstick and Waterproof instruction leaflet. Once bought it's good for life (well the life of the lightstick) but at least the MRT would be able to find these people more easily. Seems they spend a lot of time looking for the people that they could find quicker or easier if they could hear or see them.
Just a thought and yes, I know it would be difficult to get people to buy one possibly, but if bought and used, the media could then highlight the fact that "So and so were found quickly and easily because they'd purchased a rescue kit" or whatever you want to call it, sewing the seeds in peoples minds that it's a good idea rather than forcing them.
Another idea would be to have a Booth set up at the popular approaches to Mountains which simply say "First time up? Talk to us first, we're here to help" Then experienced people could advise and talk to folk, asking questions like "How long do you think it will take you?" and "How much food and water do you think you'll need?"
If MRT were doing this, or someone collecting for them, they could sell additional food, water, rescue packs and the money would go to the MRT.
Right that's it, out of bright ideas and energy and it's not even 9am