It's unfortunate that a "lessons learned" paper summarizing a sabbatical in industry doing customer-facing work would not be publishable. Surely it's far more useful to other academics than most papers. It'd definitely be more broadly relevant.
My wife is a professor in a practical field and I'm always sad to hear what counts as a "good" paper or a publishable article. The big journals in these fields drive the notion of what is and isn't legitimate research. That's the point where what constitutes career-advancing "academic output" has to be changed. But I'm not enough of an insider to have any idea of how to go about doing that.