hi nuff

some of the older papers were very different than todays ..
the paper could be sanded / abraded with a knife and darkened
with graphite dust. i worked with someone who was a master at
these old techniques taught to photographers in school
and through an mentorship ...
you might consider in addition to your bleaching and toning &c working
with liquid emulsions on papers with a tooth which might also inspire you do be outside the box.

( and what thomas said )

good luck !
john