I too would like a diesel outboard, but not for safety reasons. I just don't want to have to deal with two types of fuel. I want to be able to fuel up in one place, and shuffle fuel/jerry cans between the boat and dinghy. Also, diesels inboards seem to run forever and with less maintenance, which I hope would translate into an outboard. My research led me only to some chinese-made diesel outboards that were not suitable for use on a dinghy. I somehow didn't discover that Star one... not a bad little device (or price).
1979 Gulfstar 37 Laissez Faire