Not wanting to perform an installation to active system, our process is installation and maintenance to a non-active environment which is later copied to a SYSRES based set of files, which are mounted at IPL. The SMPE installation process hardcodes the Installation path /mvsde2/ into the installed files. 

e.g.

  /mvsde2/usr/lpp1/roa/ro/export_vars.sh            
 ****************************************************************
 #common export of PATH, LIBPATH and MANPATH           
 export PATH=/mvsde2/usr/lpp1/roa/ro/bin:$PATH          
 export LIBPATH=/mvsde2/usr/lpp1/roa/ro/lib:$LIBPATH       
 export MANPATH=/mvsde2/usr/lpp1/roa/ro/share/man:$MANPATH    
                                 
 for file in /mvsde2/usr/lpp1/roa/ro/etc/conda/activate.d/*.sh  
 do                                
   if [ -f "$file" ]; then                   
     . "$file"                        
   fi                              
 done                               
 ****************************************************************
                                 

  /mvsde2/usr/lpp1/roa/ro/etc/gitconfig          
************************************************************
[http]                            
  sslVerify = true                     
  sslCAinfo = /mvsde2/usr/lpp1/roa/ro/bin/ca-bundle.crt  
************************************************************

  /mvsde2/usr/lpp1/roa/ro/etc/conda/activate.d/ant_home.sh 
*************************************************************
export ANT_HOME_CONDA_BACKUP=$ANT_HOME            
export ANT_HOME=/mvsde2/usr/lpp1/roa/ro            
*************************************************************
  /mvsde2/usr/lpp1/roa/ro/etc/conda/activate.d/git.sh          
********************************************************************* Top 
export GIT_SHELL=/mvsde2/usr/lpp1/roa/ro/bin/bash             
export GIT_EXEC_PATH=/mvsde2/usr/lpp1/roa/ro/libexec/git-core       
export GIT_TEMPLATE_DIR=/mvsde2/usr/lpp1/roa/ro/share/git-core/templates  
******************************************************************** Botto
  /mvsde2/usr/lpp1/roa/ro/etc/conda/activate.d/ncurses.sh  
**************************************************************
export ASCII_TERMINFO=/mvsde2/usr/lpp1/roa/ro/share/terminfo  
**************************************************************

The above from a partial manual review of installed files.

After IPL we have standard SYMLINK for /usr/lpp1 which points to the sysres local version.  i.e.  /SYSRES/usr/lpp1

Looking for a way to set the future path values during install and maintenance process.

Bruce