Adios,
Thanks for so eloquently pointing out that my post is not JAR-FCL word for word.
In theory, like you say, not a problem. Simple conversion course. Eveyones happy.
In reality, an airline is very unlikely to take on an FO with a few hundred hours on type who was trained by and for a different airline. You will call that ignorence and I'd agree. But, lots of airlines have much stranger training/recruitment requirements, flyBE being one of the worst.
This has happened already in europe. MPL graduates were made redundant and unable to find work because they fall into a training 'no mans land' of low hours, low experience yet trained to very specific SOPs on one type. They can't even become FIs. Of course, their banks still wanted their monthly wedge of cash.
The point of my post was to illustrate how good the MPL works on paper but in the real world it has lots of holes in it. You might be lucky. You might not.
Unfortunately, I got PPRUNE'd by the usual crowd.
EK