I used a coat hanger for years to prop the hood. I got crafty one day and made a hook out of some scrap aluminium lying around. After showing it off on social media, there was enough interest that I started to make some extras, but after spending half an hour to finish one, I just had some professionally cut. The coathanger did the job but these are much nicer looking. Toyota discontinued the engine hood straps, and last I checked they were $45 (for 30 year old plastic). I've pulled a few of the plastic hooks form parts vans, but never really trusted them. Not sure if Toyota used the same plastic hooks for the Hiace or not.
I'm assuming you are in NZ, and if these worked in the Hiace and you know any TV owners near you that might be interested in these, you might want to pool your efforts and get them in bulk to save on shipping. It wouldn't be worth it for either of us to ship just one.