If anyone is interested i have Rocksmith Custom Song Toolkit running under linux under wine. It will also convert cdlc to ps3(as java is needed for this).
https://drive.google.com/file/d/1e2nkXEsl33Hhp5HlcF1WcKZK6wy5PHLN/view?usp=sharing
The install.sh does the following.
installs wine.
copies the required java files .
copies rstoolkit.
adds shortcuts.
It will create a Wineprefix called .rstoolkit in your home dir.
This has only been tested on my setup (Linux Mint 21.3 Cinnamon)
Only the conversion from cdlc pc to ps3 tested.
I do apologise if this is not the correct place to post this.