I'm going to piggy-back on a recent post similar to this topic but which was just different enough to warrant a new thread instead of just posting it in the existing one. I am also aware that this has been touched on in the past but I have not found direct answers to my particular query.

I'm interested in enlarging positive film (any slide film or B&W reversal processed film) onto a larger piece of traditional B&W negative film (not lith) for the purpose of producing enlarged negatives suitable for alt-process and Azo. . The issue of the contrast of slide film being too great for enlargement onto paper is void here since I'll be exposing onto film, not paper. I know people do this but I've had a difficult time finding a solid explanation and instructions for how to go about it since it is far more common to scan these days which I am very aware of but not interested in with this particular case.

Basically, can I expose/ enlarge slide (positive) film onto regular B&W negative film and achieve an enlarged negative? Is the higher contrast of slide film helpful in this situation or a hinderance? Would it be better to contact print B&W negative film (much lower contrast) onto another piece of B&W neg film to produce a positive, develop to the same contrast as the original, and then enlarge that lower contrast film-interpositive onto a larger sheet of B&W neg film to achieve the enlarged negative?

I'm interested in this specific process of enlarging film positives to larger negatives, not the alternatives so lets please try to stay on topic and not go astray with conversations of digital negatives, duplicating film, etc., although if reversal processing your original B&W neg to positive plays a role that might be worth explaining. Thank you!!