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In a medium bowl, combine raspberries with 1/4 cup confectioners' sugar and orange juice. With the back of a fork, lightly mash berries to release their juices and let sit 10 minutes. Meanwhile, in a large bowl, stir together mascarpone and 1/2 cup confectioners' sugar until smooth. Whisk in cream, vanilla, and pinch of salt and whisk until soft peaks form, about 4 minutes.
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Cut one or two pieces parchment 1 inch taller than side of an 8-inch springform pan and line inside of pan. Place half the ladyfingers in pan and top with half the raspberry mixture. With a small offset or rubber spatula, spread half the whipped cream over berries. Tap pan gently on counter to remove air bubbles. Repeat with remaining ladyfingers, raspberry mixture, and whipped cream.
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Top with blueberries and refrigerate until whipped cream is stiff and cookies have softened, about 3 hours (or, tightly covered with plastic, up to 3 days). To serve, unmold trifle and peel away parchment.