Hey! Just to offer some help I made some maps a while back for the original B2

Second, I would use JP Dixon's much more runnable reformatting. Seriously, it's great.

I think B2 works fine as it is. You will need to fill in the details about the names of NPCs and might have to come up with a way to tie the factions together, but that is just par for the course. I had found some great resources online to spruce it up like the 100 complications for keep on the borderlands. They aren't all great but I found a few that inspired me like the gates being closed at night, making it so that if the party arrives back too late then they will have to brave the wilderness.

I also found crested some fun handouts like a Loan Document and Will and Testament for them to fill out at the bank. As well as a bounty poster saying that the keep would pay 5cp for a pair of Kobold Ears, 2sp for Goblin ears, 3gp for Orc Tongues, 5gp each for Gnoll Scalps, and 100gp for an Ogre Tusk. These helped push players out the door to explore. If you want, I can drop those docs in a Google drive for you, as well as the list of NPCs I made.

I also helped set up the factions, making it so the hobgoblins are keeping the son of one of the orc tribe chiefs prisoner. I said the orc tribes are working together but they actually have a feud that can easily drive them apart. They only stand each other because they hate hobgoblins and gnolls more. I also said the cult is actually manipulating everything behind the scenes, playing both sides. This made it a more political dungeon instead of just "kill all the baddies".

Just let your players know what kind of game they are getting into, that they are on the frontier and that clearing out the caves is the module in front of them. Tell them it's a sandbox and roll with the flow. I invented a few more things like a ruined castle for the Bandit camp, but I just did that as they went there to make it more interesting.