For when you move to EG4, I've now found the same functionality in EG4:
(1) Open the project in EG4.
(2) Click on Tools > Replace SAS Server...
(3) Highlight the server(s) you want to replace in the SAS Execution Servers, or OLAP Servers, list and click the Replace button under that list.
(4) Choose the correct server from the list and click the Replace button.
It does the same as the EG3 program, but is called from inside EG4.