Multi spray gun

How about an in line hose connector with a shut off valve, if you don't have a supplier on the island I am sure you would get it in Oban or from Amazon if they deliver to the islands

do you mean one of these ? 




Thanks for the suggestion     but I hate them , I’ve lots of those. Takes to long to twist on or off. 

No its a simple on off gate valve that has a female hose connector on inlet and a male connector at outlet, can't copy and paste on my tablet to show what I mean, but using this would allow you to keep your existing sprayhead