I’m curious as to why you think Publish to Web is not a good option? If I understand correctly, you’d be using it to allow potential clients access to your sample reports. In that case, PTW would seem ideal, since not only don’t you mind if people forward the web link around, but it would be to your benefit from a marketing standpoint if they did.
And in PTW, it’s literally one click and you’re in - no login, no authentication. I’d recommend checking out the postings under eDNA Data Challenge 1 and 2 - a lot of folks published their results to web, and you could take a look and see if that approach would meet your needs too.