Multi-currency cash machine

I have no idea whether this works for bank cards issued by banks in other countries, or for all conventional credit cards, but I'll assume so, or admit this is a UK/Euro-centric idea.
I can put my bank card into any cash machine in Europe and take out cash at the instantaneous exchange rate, with no commission. (I can also do this with my credit card, but for cash and shop transactions it costs a fee. With the debit card there is no fee). Taking cash out in this way is actually cheaper than 'buying' currency in your home country, because your bank at home will set different 'sell' and 'buy' exchange rates, to make money on the rate rather than have to call it commission. However, on arrival in a country which uses a different currency, it is useful to have at least some of that money in cash - but you may not be able to find a cash machine in the arrival airport, or it may be defective, or too late at night (many other reasons). So, I think it would be useful for departure lounges in airports to have cash machines which dispense a number of different currencies. This would ensure that when you arrive you would not have to be locally penniless, but could have taken out at least as much cash as you might need for the taxi into town to your hotel, at the instantaneous exchange rate rather than your bank's inflated 'sell' rate.
No, I don't know how this would do the service providers any good, other than create some goodwill. Presumably, if it was a popular service, the sheer volume of money being taken out of these machines would justify itself, and perhaps a half-percent tweak to the exchange rate of the most popular few currencies would enable a slight profit for the bank or consortium of banks which provided this. Ironically though, this may be a service which would be more necessary or highly desired in small airports in obscure countries.

Consumer advice: Budapest Ferihegy airport has a cash machine in the baggage hall. Thankfully, because you can't buy Hungarian Forints outside the country.

Also I've thought about posting an idea for a sort of 'international airspace' for mobile phones, so that when past the passport control gates, your phone runs on a sort of tax-free system, so that all calls are taken as national rate, rather than international. Would it raise the standing charges for people who only use mobiles in their own country? Probably, but it's so expensive anyway - would you notice? I guess it's just another goodwill gesture; for people who take their mobiles on holiday, but only to call from the airport on the way back to warn their friends picking them up if there is a delay. Thought that was perhaps not too common a situation.