After creating the Reverse Engineering tool and expanding it to read Atari adventures also it occured to me that, given that the structure of the adventure data was pretty consistent between each platform it should be possible to automate the translation from one to the other. This tool shows what I have achieved so far.
Currently the tool only converts to ZX Spectrum format but I will undoubtedly add more later. Pick a Quill file to convert - Atari .xex format, C64 .vsf format or a .json file in the format generated by the reverse engineering tool and the game will generate a ZX Spectrum .sna file that can be played in an emulator. Conversion of colours or sound has not yet been attempted and there may well be other anomalies encountered.