Office to iWork: batch conversion

I have years of Office files -- various .doc, .docx, .xls, .xlsx, and the rest -- sitting in various folders. I'd be interested in converting all of them into .pages and .numbers files.

What I do does not require 100% Office compatibility. I'm a minimalist and would sooner have either Office or iWork on my MBP -- not both. I use iCloud for mail, contacts, calendars, notes, tasks/reminders, Safari synchronization, and Find my Phone -- barring a switch to another service for mail only, I suspect I'll probably stay on iCloud, or at least mostly iCloud except for mail.

Have Googled this but found only a few thoughts. Does anyone have any suggestions on how I might batch convert a big tree of folders containing Office files to their iWork counterparts?

 

Sure, only thing is that any changes, once saved, create an iWork format file. Was trying to do all of that at once and not have to do them one by one.

 

Have again attempted to find third-party solutions and not having much luck. Any suggestions welcome.