In a medium bowl, toss together apricots, cherries, raisins, and rum. Cover and let stand for 12 hours.
In the bowl of a stand mixer fitted with the dough hook attachment, combine ¾ cup warm water, 1 tablespoon (12 grams) granulated sugar, and yeast. Let stand until mixture is foamy, about 10 minutes. With mixer on medium speed, beat in egg, vanilla bean seeds, zest, and remaining 3 tablespoons (36 grams) granulated sugar. In a medium bowl, whisk together flour, salt, nutmeg, and ginger. With mixer on low speed, gradually add flour mixture. Add butter, 1 tablespoon (15 grams) at a time, beating until a smooth dough forms, 5 to 8 minutes.
Spray a large bowl with cooking spray. Place dough in bowl, turning to grease top. Let stand in a warm, draft-free place (75°) until doubled in size, 1 to 2 hours.
Line a baking sheet with parchment paper.
Turn out dough onto a lightly floured surface. Knead fruit mixture and almonds into dough, discarding any remaining liquid. Cover and let stand for 10 minutes. Divide dough in half. Pat one half of dough into an 8x8-inch square. Divide Marzipan in half, and shape each into an 8x1-inch cylinder. Place one cylinder of Marzipan at one end of dough square, and roll up. Pinch ends under, and place on prepared pan. Repeat with remaining dough and Marzipan. Cover and let stand until puffed, 30 minutes to 1 hour.
Preheat oven to 350°.
Bake until golden brown and a wooden pick inserted in center comes out clean, 35 to 40 minutes, covering with foil halfway through baking to prevent excess browning, if necessary. Brush loaves with melted butter, and sprinkle with confectioners’ sugar. Store loaves wrapped tightly in plastic wrap at room temperature for up to 2 weeks.