Hi Barry
Using the cost of living arbitrage is good strategy for getting more life for less money.
To what extent is it feasible to keep getting/changing jobs in the future-
- clearly this depends 1)on what you do 2) how much you enjoy it.3) level of ageism in the area as you get older...maybe you will be able work in your 70s?
As I am sure you know they always need english language teachers abroad!
Its worth making sure your work is "on the books" in each country regarding future state pension entitlement .
Not sure given your level of savings and impact a loss might have i would risk much of it in equities etc.
good luck