Dear Carl,
First, sorry for the delay in replying, I just saw your post..
Second, I am ofcourse with every opportunity that would get you in the system (even temporarily), even volunteering would be a good opportunity (if a person can afford not being paid for a while), but unfortunately I don't know exactly about its requirements.. Still, I suggest you contact the access center I have given their website before & register as they offer one to one counseling & answering of all your questions on Skype, on the phone or one to one (whatever you wish for).. I have registered with them & they have recontacted me but I haven't still done the online meeting..
When I speak with them I'll ask them about locums as well & come back with the answers..
Wishing you the best & good luck always..
Basmalahh