mass delete inactive bbpress forum participants

Hi there,

I've recently converted phpBB to bbpress. Now I'm doing some housekeeping.

I want to be able to search for and delete inactive forum participants, i.e. those who have not replied or posted new topics in the last 12 months.

I'd expect there to be a plugin for that kind of function, but I've not been able to find anything.

Any suggestions?

Thanks.