Over a decade ago I moved to another city and as I was young and bored I searched for a new band. A hardcore band invited me to a practice and their guitarist (I was to replace) was there (he came 30min too late, though). He opened his case and kinda awkwardly I was like "Oh, you've got a 7 string. I don't have one.". So their drummer chimed in "Just so you know, he did not want a 7 string. He just did not notice in store, that it had 1 string more. So he just tunes the B string to D (D Standard) as well."
Sounded shit. But it's worth a try, I guess?