What do you mean by "registered as a freelance pilot?" Registered where, and with whom?
It seems with all of this, it's the insurance that will pose problems as you need ferry experience to get the decent jobs, but you'll never get that experience and so won't get insurance to make a trip! Plus, nobody will allow you to tag along with them, as it adds to the risk for the insurers, and I don't think the guys doing this for a living are all that keen to let anyone else have a bite at the cherry, and like to run a closed shop and corner the market.
That said, you could always go rogue and accept the lower end of the work, flying in death traps that nobody else wants to take, teach yourself how to sort out all the paperwork, and everything else that goes with it, and barely make any money until you've built up some experience.
Would be interested to hear if you get anywhere. There's obviously work there, but seems like a difficult world to get into, and not one that anyone will go out of their way to help you with.