They also have a course where they take you on as a FI for one year after training so i'm looking into that at the moment too.
You have to undertake a full year of training first to be eligible for OPT and OPT is entirely that - Optional. There is no assurance that any Flight School will offer 100% OPT. Imagine 50 Students - are they really going to take all 50 on for OPT? During the year of OPT, you pay your living expenses, medical coverage etc and you only get any form of payment if you are actually working - not sat on the bench.
Just be aware that it can become expensive.
Plus you would require FAA certificates - CPL, CFI/I etc not just JAA.