What types of administrative jobs can a faculty member get?
I feel this is a question that's almost better suited for The Workplace. My fear in your case would be that you, having been a department head previously, are seen as vastly overqualified for almost every non-leadership administrative position (and leadership positions tend to not be filled as quickly as you mention). It may appear surprising to meritocracy-oriented academics, but people are generally not prone to hire overqualified staff - motivation and job satisfaction can become issues, and they are expected to not stay on long (as you yourself also don't intend to do).

That being said, I can't help but wonder whether you have any contacts in the UK that you can activate. Maybe there is some temporary administrative role that would suit your skill set, or a temporary teaching position in courses related to your experience. To me, that seems like a more promising shot than blindly applying to regular administrative posts, and hoping that the hiring team sees your very unconventional background as a positive.



As a sidenote, I also wonder why you are confident that you will find a faculty position in a year unless you already have one lined up. As I understand it, senior-level hires in the UK are a pretty rare and long-running processes, and hoping for one within a year, which you then also need to win, seems to be putting a lot of eggs into a very specific basket. If you already have one lined up, talk to the people there about some temporary contract in the meantime.