I saw thread https://www.b4x.com/android/forum/threads/save-as-for-modules.167903/ and thought 'challenge accepted' - it wasn't that daunting 
Put the jar in your additional libraries folder(s) and then in your B4X code add this comment link:
It
- copies the source directory and all its contents and subdirectories, except the 'Objects' one(s)
- handles all the sub-projects for B4XPages projects
- renames the '.b4*' and '.b4*.meta' files to the new name
- and, if desired, opens the new project with its IDE
EDIT: as noted by @LucaMs , it does not cater for project modules that are linked to folders outside the project folder.

Put the jar in your additional libraries folder(s) and then in your B4X code add this comment link:
B4X:
'Ctrl + click to 'Save As' : ide://run?File=%ADDITIONAL%\B4XsaveAs.jar
It
- copies the source directory and all its contents and subdirectories, except the 'Objects' one(s)
- handles all the sub-projects for B4XPages projects
- renames the '.b4*' and '.b4*.meta' files to the new name
- and, if desired, opens the new project with its IDE
EDIT: as noted by @LucaMs , it does not cater for project modules that are linked to folders outside the project folder.
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