If you want rename your layers under autocad I suggest you do a autolisp file that you will run on your dxf. In this autolisp you ask to save in dwg in same time
you can start with a .txt file and rename the suffix .scr
you can go on autocad forum for copy past some group of autolisp code line for specific tasks, good start for be familiarized with this kind of code.
Or maybe ask to the Admin of this Aveva forum if we can create an Autocad topic?
Once this file is ready you can drag it in autocad when your drawing is open.
for this specific task about layer renaming I can give you this example:
(command "rename" "LA" "GT_1" "OUT_OF_FONCTION")
