Yes, you can invoke the book editor without starting calibre.
See calibre manual for command-line usage:
ebook-edit [opts] [path_to_ebook]
Launch the calibre edit book tool.
Whenever you pass arguments to ebook-edit that have spaces in them, enclose the arguments in quotation marks.
[options]
--detach
Detach from the controlling terminal, if any (linux only)
--edit-file
Edit the named file inside the book
--help, -h
show this help message and exit
--version
show program’s version number and exit
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