As long as you have access to a plentiful supply of pomegranates there shouldn't be a problem - they contain lots of tannin, not too dark.
https://www.researchgate.net/publication/376326147_Tanning_with_Pomegranate_Peel_Tannin
The abstract gives info that might be useful in determining the quantities to use. Some math involved!
Here is the list of requirements for bark tanning from "The Bushman's Handicrafts" by R. M. Williams (still in print, I believe)
Lime for dehairing
Chemical bate or fowl manure for bating
Bark extract for tanning (sub. the pomegranate extract here)
Mutton fat & neatsfoot oil for oiling.
Keep us posted on your success.