I’ve completed the work for CSV 2 POST to allow complex headers i.e. My Images instead of myimages or Terms & Conditions instead of termsconditions.
If you cannot wait for an update on here please contact me for the latest build.
I pushed for more simple headers during re-development. It was a decision that seemed good at the time but not long after release and some complaint I realized it’s a suitable requirement to expect from developers. Not the average WordPress user.