'Scuse ignorance, but what's B2?
The D&D module
B2 Keep on the Borderlands.
To answer the OP:
Dungeon Crawl Classics #28: Into the WildsIt details the small border town of Wildsgate and four distinctly different dungeons in the nearby mountains. The description of Wildsgate is better than the Keep (but less intricate as, for instance, Hommlet). There's a curse on the town, lots of rumors and adventure hooks.
N5 Under Illefarn, one of the best intro modules that ever appeared for a new campaign setting.
It was a bit like Keep on the Borderlands, with a small keep/town as a base of operations, but this time fully integrated in a setting. Lots of descriptions of local movers and shakers, and a dungeon not far away. (Sadly, that dungeon itself was quite bland and not nearly as iconic as the Caves of Chaos.)
I am not a fan of the Forgotten Realms but I'd use this module almost as written, and let "My Realms" grow from it.
David Bezio's
The Phoenix Barony.
Other than those, seconding
BF1 Morgansfort: The Western Lands Campaign, plus their companions
BF2 Fortress, Tomb, and Tower: The Glain Campaign and
JN1 The Chaotic Caves that all share the B2 vibe.
Also,
Ludibrium Games' trilogy is most excellent:
The Sanctuary Ruin, Ironwood Gorge, and
Kingmaker. (I have fond memories of running the first one with
Riddles & Rings.) Too sad that only the first one ever appeared in print.