Peter, I am a system admin/eng who has been recruited and is training on the job as an IT Auditor. I've been on the job for 8 months now, and think I might have good hope for you.
The IT Audit field is SO tight right now that some shops are willing to take in & train, as long as the company has large enough of an audit staff to help guide you along. I work for a financial company in Des Moines, IA, where we have 3 Sr. operational auditors, their manager, and a director. We also had (before I came) a Sr. IT Auditor & Manager under our director, and a slew of other team members under my manager in other offices. So far the team has been as helpful as possible, but the road into IT Audit can be rough on an IT person. Hopefully, as a programmer you're more used to writing long paperwork in conjunction with your planning, testing, & such. Also, your experience with code, production, source, executable will help you as well.
I think that tayloring your resume towards your new goal is a must. Also, in your studies, read through CoBIT (www.isaca.org). Understanding CoBIT and its methodologies & policies will help you identify risks and prove them as risks better than just waiting for experience to come.
I do not have the CISA or CISSP, but hope to as I go through my career, and eventually become a CIA (Cert Int Aud) as well. Showing the initiative and doing the work will truly help you land a job, but be patient.
It might not happen fast, or it might. I'd start networking with recruiters on the accounting and IT side of things, and have them help you get the ball rolling on your search, and by the time you pass the CISA you'll probably be working already.