Allow the developer to change the values of the Nodes in the expression tree

[EvanHennisAtMicrosoft]

I would like the ability to update the values that are passed into my Api from the users. For example, the users passes in an ID that they know but we have an internal id that needs to do a conversion. These ids are stored in a different schema so that we can't just do the conversion in a Linq Select function.

Example:
User passes in: https://amazingwebsite.com/products?$filter=id eq MyBarCodeValue
I need to take 'MyBarCodeValue' and query our common database to get our Id back of 'InternalPrimaryKey' and use that as the actual id value.