The back track you mention is still accessable. Got in the other day no worries. Yrs ago it was heaps quicker than the main track. Use the main track and turn right a the top of the hill just b4 the final last rough sestion. It will take you to the last bit of the back track.
if you know where it is you will know exactly what i mean.

To all those SUP haters out there i SUP it often but still grab my 6'3" when its pumping