Further research revealed the triple-square is a German fastener and is not used on Japanese vehicles.
To resolve the issue I took a hi-res photo of my engine bolt and estimated the facet angle. It's definitely not triple-square. If you said 12-point "double hex," you nailed it. Now that I know I don't need a special tool I should have these bolts out tomorrow.
Triple square are definitely on Mercedes and Audi and are a real pain. Like most European engines, they are the same ........but different
Whole new toolbox required
At least the Japanese use metric standardized fasteners on the majority of things.