There was an episode on Wheeler Dealers this week where they opted to use waterless coolant, and stated all the above positive points. They put it in a Triumph TR6 they were sorting.
It looks great stuff, but was pricey at £90, but as said it's a lifetime product and has some great benefits. He did however, have to remove all traces of existing water within the engine, using another product to flush it and a compressor to blow it through, think it took a week to get it ready prior to using the waterless coolant. So may be worth looking into what prep is needed?
Can you add rad weld to it if needs be in an emergency I wonder?
Found This on Evilbay - Evans Waterless Coolent £26.95 2L
http://www.ebay.co.uk/itm/PowerSport-R- ... SwnipWXBbuIt also recommends using Evans Prep fluid to purge remaining water / old coolant from the system
Prep Fluid £15.19 2L
http://www.ebay.co.uk/itm/Evans-Prep-Fl ... Sw9mFWHOzyJust a couple of examples, other brands are available, lol. It may be worth buying the 5L options and do a couple of bikes, and sharing the cost, as there's always a friend in need!