Hi unearthed, sorry for the slow response (seems my original reply dissapeared). Our new online solution (AutoTURN Online) will offer SketchUp users the solution you mention. Besides a yearly subscription you can also choose for a 1 month subscription, that could save single time users a lot of money.
The cost will depend on your region and ´vehicle libraries´ used. For 1 month use with 1 vehicle library the pricing would be in the range of $70-$120.
It was officially launched last week and should provide a swept path solution for SketchUp users. We do not yet support all regions but we do support yours (NZ).
You can currently test it for free before your purchase at http://www.autoturnonline.com