The 4wd tracks around Wollombi are the Yengo trip from the Putty Rd through Big Yengo that comes out at Wollombi, or the track out of the Watagans. Neither of them go near St Albans. My book is old 5th edition.
A day trip is to start at Windsor and plan to cross every bridge and ferry all the way to Wiseman's Ferry, then do the run from there to St Albans. A nice trip but 2wd.
A weekend trip is to go up the Putty Rd, hook a right onto the track through Yengo that goes past a few interesting places. It's not hard but better done in low range in a few places. Camp at Wollombi Tavern for free Saturday night, then go down the Northern Rd to Bucketty and swing right to St Albans for Sunday lunch. The Yengo trip is #17 in my book. The entrance to Yengo off Putty Rd is very easy to miss because it's just a gate on an indistinct driveway with no signage. Download those treks and put them into your navigation software.