A bright yellow reflective vest should do just fine as I see it. I happen to have one and have used it when bicycling on rural roads.

Quite agree about bright colors when cycling. For me, a yellow or orange jersey is de rigeur when on the road. The same goes for pedestrians, especially at night.

I was thinking about the yellow vest in the context of being seen in a emergency situation in the wild. Usually I wear dark or camo clothing in the bushes. The yellow reflective vest I have folds down to a small package that fits in a pocket. Meaning it is easy to take along and having available when needed to be seen. And bright yellow should be even more effective than orange.

and strobes are now very small - 1" by 1/2"

For that matter, a good many contemporary flashlights have a strobe function (not always that accessible).

Rule #7
"You WILL get lost; think about how you get found."