I would highly highly recommend you to find problems you have seen in accountancy world that you can solve with programming. You could get both of both world, satisfaction of work you want to do while benefiting from your industry experience. No programmer (not in accountancy world) here knows about the issues and inefficiencies about it than you do, and you probably have a bunch of contacts you can test your ideas on. That way you keep your advantages of being in the accountancy world, while solving the issues they have by using programming which is what you want to do.

whatever you do, good luck.