I did this 18 years ago. It took seven years to get the paperwork for the right to live and work here, and a few weeks to convert my CAA CPL and instructor rating.
I wasn't actually planning on instructing as a career when I got here, just did the conversions anyway. And the rest is history.
Yes it is much better here than watching the rain pour down the briefing room windows in the UK but I would always say...never put all your eggs in the aviation basket and have a plan B if you are planning to come out here.
Instructing on a working holdiay...for the cost of the conversion you would never be able to get a return on that investment in the time you were here, even if you could find an emlpoyer who would go through all the induction etc for someone who can only work 3 months in one place.
I think the rural thing only applies to people working in agriculture, could be wroing; sadly not many flying schools in rural areas anyway.