Can I layer Lemon curd and Lemon Mousse?
There are several recipies on the internet for this though most have the lemon curd on top of the cheesecake.  Mary Berry has a version where she includes the curd directly into the marscapone mixture, so it doesn't seem likely it will curdle.  

Putting it onto the biscuit, then adding the cheesecake mixture might cause other problems, either the curd could be pushed out of the sides or moisten the base too much.