Really good question, and I think you've done exactly the right thing asking it.
Let's be honest, it is not going to be easy for you to get started. What employers want is experience, experience, experience in exactly
the field they are recruiting into. They will sometimes waive this requirement for recent graduates because they are cheap and perceived to be "mouldable".
BUT plenty of people have managed to achieve this - I know, I've employed a few! The challenge is finding that first job, adn I expect you've already worked out the trick is to use the experience you do have to your advantage. You mentioned testing: well, to the right open minded company someone with real forces experience is ideal to add value as a tester, and it's then a case of worming your way in. Similarly it should be possible to start off in design risk management and then move sideways. The key is often to find a job which is broadly similar to the area you are already working in, but in a department (or at least company division) which has the type of work you are aiming for.
From my experience I would suggest that it is not worth worrying about brushing up on your university notes too much at this stage. A half decent interviewer will work out pretty quickly that that is what you have done, and whilst it will earn some points for effort it can also emphasise the (usually inevitable) patchiness of your memory / refresh. Although, as you say, do make sure you understand the absolute basics of the technical content of whichever job you manage to get an interview for. Read any job description thoroughly, and then think about how your services experience covers the areas they are looking for.
I would also suggest finding a mentor, ideally in the area you are planning to move into, who can give you honest feedback on how you come across. The IET mentoring schem should be a good start.
And don't give up if you struggle to find the right role - keep on plugging away at it!
Andy Millar CEng MIET CMgr MCMIhttp://www.linkedin.com/in/millarandy
"The aim of argument, or of discussion, should not be victory, but progress." Joseph Joubert