The EPDM Convert Task will create your dxf - that is what it is meant for. (tho output is not always perfect, at least with pdf)
The problem is selecting the group of files to run it on. And, counterintuitively, there is no easy way (unless you have some variable in common on all the files already).
I thought of another imperfect workaround - you could use Copy Tree on your assembly - to copy all the referenced files and add some "tag" to all the filenames, put it in a temporary folder. Then you search for that tag and run the Task on only the slddrw. Caveat - in User/Group settings you can set variables for Copy Tree to change or clear, so the copy could be different than the original if you set this up.
Good luck and let us know if you figure something out.
There's a way to "fool" the system and use the print task option for converting a parent and children