That is a good idea and not something I have considered. Also, has just made me think I could learn an instrument also. Need to justify the potential career change though and not sure what I would use it for.
Without knowing your circumstances (mortgage, U.K. based responsibilities) it may not be possible, but given the chance you pick somewhere you like on the map, get capable in the local, combine it with a TEFL qualification and the world's your lobster!
As per JP above, the female only track work could be a great opportunity, I'd bet there's women who'd much rather have a crack on a single sex day/event (not to mention a few blokes who'd have no problem taking female tuition). A quick Google and some emails to tracks would tell you how many are out currently there on offer and if there are women asking on forums or contacting them with enquiries. It wouldn't cost a bean to do some legwork and get an idea if there's a market big enough to support a salary after costs.