Heat 1/4 cup sugar, the lemon juice and 1/4 cup water in a saucepan over medium-high heat, stirring, until the sugar dissolves. Remove from the heat and stir in the almond extract.
Brush both sides of each slice of cake with the syrup. Cut the slices into 1-inch cubes.
Beat the remaining 2/3 cup sugar and the cream cheese with a mixer on medium speed until smooth and light. Add the cream and beat on medium-high speed until smooth and the consistency of whipped cream.
Note: I used frozen blueberries for the inside of the trifle, as they are not as tart as the 'fresh' ones I can get in Oklahoma. I did use 'fresh' ones for the top, though.