Python script to rename shells during DB conversion

Hello I'm asking this question on behalf of a customer:

"We are currently converting lots of *.CSB files to *.FBX with DELTABATCH. There is an additional requirement to change the names of groups and shells in the resulting *.FBX files manually to by in line with the naming convention and we would like to automate this process if possible."

Is it possible to run a Python script during the DELTABATCH conversion process to rename shells automatically without altering the original file?

The scene tree of the original *.CSB looks like:

group_1
      body_1

            shell_1
            shell_2
group_2
       body_1
              shell_1

We want to automatically rename it in the *.FBX file to:

group_1
      body_1
            asset_shell_1
            asset_shell_2
group_2
       body_1
              asset_shell_1


Any help would be greatly appreciated. Thanks!