There are many crap to fudge converters lying around.
You should be able to find tools to decode the lossy part of DTSHD for mac. Maybe FFMPEG &/ GUIs.
The only thing that can possibly decode the lossless part of DTSHD for mac would be https://github.com/foo86/dcadec if it is able to be built for mac, or the commercial DTS quicktime component).