Make the strawberry base: Add strawberries, 1/2 cup water, lemon juice, and 2 to 3 tablespoons sweetener to a small saucepan. Simmer over medium heat for 5 to 7 minutes, stirring occasionally, until the berries soften and release their juices.
Blend smooth: Carefully transfer the mixture to a blender and blend until smooth. Taste and adjust sweetness if needed.
Bloom the gelatin for the base: In a small bowl, sprinkle 1 packet of gelatin over 1/4 cup cold water.
Let it sit for 5 minutes until spongy.
Combine and dissolve: Return the strawberry puree to the saucepan over low heat. Stir in the bloomed gelatin until fully dissolved (1 to 2 minutes). Do not boil.
Portion and chill: Divide the strawberry mixture among 6 to 8 small glasses or ramekins, filling each halfway.
Refrigerate for 30 to 45 minutes, until just set but still slightly tacky on top.
Start the creamy layer: In a clean saucepan, add heavy cream, almond milk, vanilla, a pinch of salt, and 1 to 2 tablespoons sweetener. Warm over low heat until steaming, not boiling.
Bloom the gelatin for the cream: In a small bowl, sprinkle the remaining packet of gelatin over 1/4 cup cold water. Let stand 5 minutes.
Finish the cream: Stir the bloomed gelatin into the warm cream mixture until completely dissolved.
Remove from heat. Let cool 5 to 10 minutes, stirring occasionally, until just lukewarm.
Layer it on: Gently pour the creamy mixture over the set strawberry layer. If the base is still soft, pour slowly over the back of a spoon to avoid breaking through.
Chill until firm: Refrigerate for at least 2 hours, or until both layers are fully set.
Garnish with sliced strawberries before serving, if you like.