How are you planning to swap over to the new machine? Note: this is often more about planning, documentation and testing than the technological parts.
========================================== Cursors are useful if you don't know sql. SSIS can be used in a similar way. Beer is not cold and it isn't fizzy.
if you want to back up from your primary server and restore on the secondary server then the 32bit vs 64 bit doesnt matter. If you are thinking about including the 64bit server as a new node in the cluster then its not possible. All nodes have to have same version of the OS and SQL Server and similar hardware (it has to pass the Cluster Validation test).