Hi,
I am working on a little script to do this for you.
Currently it can be done with ClustExp_StatParse.py, but it was designed to do much more.
And you will have to provide all of the other required inputs for it to output a mask.
It will output a mask, thresholded at a specified p value.
See here:
https://afni.nimh.nih.gov/pub/dist/doc/htmldoc/tutorials/ClusterExplorer/Introduction.html
I will just chop out the portion that outputs a p value thresholded mask and put it into separate script.
In the meantime, check out the Cluster Explorer.
Thanks, Justin