For the Cheesecake Layer combine the soy milk, sugar & agar powder together in a medium sauce pot and whisk smooth
Continue whisking over medium-high and bring to a boil then reduce heat and simmer for 2 minutes.
Lower the heat and add the cream cheese and apple cider vinegar and whisk vigorously to smooth
Pour immediately into the prepared frozen crust
Refrigerate until set, this should only take about an hour or two
Once the cheesecake layer is set, cover it with the remaining crust that was reserved from earlier., then you can make the lime pie layer
For the Key Lime Pie Layer combine all the ingredients for the key lime pie recipe together in a medium sauce pot, heating and stirring until thick and starting to boil.
Let boil for just about 15 seconds
Add the optional food color, pour over the set cheesecake and crust layer in the mold
Refrigerate to set 2 hours or overnight
Unmold then garnish with optional cream cheese icing and fresh lime slices