I was considering the ascent via Colam Woods as its a bit quieter then coming down TMNH to start a couple of climbs, but might do the Sandon approach as well as that's quieter too... plenty of time on trains before then to ponder routes and repeats ....
There's certainly at least 6 ways I can think of ascending to the top of TMNH, probably more if you use more of the lanes over toward Woodham Walter ... Sandon to Danbury or Bicknacre to Danbury then along The Ridge. Colam Woods, Doggers Lane and lastly Graces Walk (haunted by the ghost of Lady Alice Mildmay after she drowned herself in Sandon Brook (1615) to escape the cruelty of her husband, Sir Henry Mildmay apparently). And of course, straight up TMNH itself...
Graces Walk might be a bit of a quagmire at the moment (its almost a beach at the best of times!)