What succulents are food safe. To decorate cakes, cupcakes.

maybe this link can help you

https://worldofsucculents.com/edible-cacti-and-succulents-plants/

https://www.onemedical.com/blog/live-well/healthy-edible-succulents/

Safety first: Never add flowers from nurseries. Edible flowers must come from organic sources. Also remove pollen and pistil as some people can be allergic.

Practically all fruit and herb blossoms are edible, i.e. acassia, almond, apple, banana, lemom, orange, peach, squash, chive blossoms...

flowers: acassia,violets, violeta, alyssum, baby tears, bougainvilea, boston fern, poppy, camelia, chamomille, carnation, Xmas cactus, chrisanthemums, dahlia, daisy, dianthus, lily, english primerose, fushia, gardenia, scented geranium, hibiscus, hollyhock, impatients, jasmine, lavender, lilac, marygold, mimosa, nasturtium, petunia, phlox, pussywillow, roselle, snap dragon, zinnia.

Again, ONLY ORGANIC!

I think you'll find this helpful https://www.cakecentral.com/tutorial/30858/gumpaste-succulent-tutorial