Here's a set of utils to manipulate files that were copied from TR-DOS diskettes. The tools were written to simplify the following workflow:

1. Grab diskette image using Hobeta tool.
2. Strip the file header and save the result to a new file.
3. Convert resulting Zeus Z80 assembler file to the plain text format.

But you can use them in the way you need. And it's very easy to use: download the package, run setup.py, invoke in the following way:

$ python -m zxtools.hobeta strip input.hobetta result.zeus
$ python -m zxtools.zeus2txt result.zeus listing.txt

NOTE: You need Python 3 to use this package.