Bring a pot of water to a simmer. Place the egg, egg yolks, and ½ cup honey in a heatproof bowl. Place the bowl over the simmering water, making sure the bottom of the bowl does not touch the water. With a handheld mixer, beat the mixture until pale yellow and thick. Remove from heat and let cool.
Whip the cream or coconut cream until thick peaks form. Fold the cream into the honey mixture.Transfer to the prepared loaf pan and freeze for at least 3 hours or overnight. (Can be made up to 3 days ahead and kept in the freezer.)
When ready to serve, turn the semifreddo out onto a rectangular platter. Drizzle with the remaining 3 tablespoons of honey and sprinkle with the almonds. Cut into slices and serve.