Play with the base…
N 110110 11101.1111011010
W 110 10.1111010000
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You can not park on the road but there is a car park at the Premium Inn which you could use if you feel cheeky enough, and failing that there's lots of parking space at the Sprucefield roundabout at the Marks and Spencer complex.
Closest access to the tow path is via steps from the bridge on the main Lisburn to Sprucefield Roundabout Road at N54 29.934 W006 03.122
Please replace "stickoflage" after finding.