Made-to-measure saddle

the only one I've managed to find are those Spes 175mm wide one that just about cover my sitbones, but the front end is too thick and rub against my legs.

perhaps you could look into stripping one of these and then having the front end sanded down (or something like that) to narrow it and then recovering? not sure if the rails are spaced further at the nose of these saddles, but might be worth thinking about as it could be quite easy to do.