@holdboyes They can contract you as an independent consultant initially, but you definitely shouldn't agree to going under the radar, there are too many dodgy companies like that, consult first and then if it works out you can look to move onto an employed situation which will involve paperwork for them.
@holdboyes if they dont hassle it means they dont really need you. I myself will never relocate w/o a proper deal written and signed. Just to be in safe side and for your career, future, state of mind, etc. I dont see any excuse from their side to do not proceed with the papers if they want to hire you. It's just damn logical for me.
One simple word.....
@holdboyes do not go with a sharp decision on your own. Allow some more additional tine and discuss with them a possible negociation to lead you to a proper deal. Squeeze them. See what they have put aside for you. Good luck!