Implement seamless Compute function on SQL Server 2012

Information: We are in the process of Testing our upgrade from SQL Server 2005 to SQL server 2012 on staging. In reading the documentation on features that will no longer be supported, COMPUTE (Transact-SQL) going away is going to be an issue for us.

Question: Is there any way to write out own procedure that will take the place of the compute builtin on SQL Server 2012 that will make it seamless so when Compute is called it will function like SQL Server 2005? The alternative is we will we need to update all the SQL files, UDF's, Triggers, and stored procedures that use this built in with alternative code?

Note I have never tried to recreate a built in function before so any information on this will be very helpful for me and anyone else trying to do this in the future. Also knowing if it can be done is a plus.

Clenup: As always if this is a duplicate post indicate the link below and i will remove my post.