COMBINE cracker crumbs, oats and brown sugar in medium bowl. Stir in melted butter with a fork until evenly moistened. Press into 8-inch springform pan.
BEAT 1 cup heavy cream until stiff peaks form. Beat in 2 tablespoons sugar and lemon extract. Place cream cheese on microwave-safe plate. Mircowave on HIGH 15 to 20 seconds or until very soft. Add to whipped cream, beating until smooth. Pour boiling water over gelatine in small bowl. Stir about 2 minutes or until gelatine is completely dissolved. Beat into cream cheese mixture until blended. Stir in 3/4 cup preserves. Spread over crumb crust. Chill 2 hours or overnight.
BEAT remaining 1/2 cup heavy cream until stiff peaks form. Beat in 1 tablespoon sugar. Place in resealable plastic bag. Cut small corner off bag. Remove outer rim of pan. Place dollops of whipped cream around outside edge of cheesecake. Stir remaining preserves with fresh blueberries in small bowl. Spoon evenly in center of cheesecake.