Hey Rick et al.,
Just to follow up, this turned out to be much simpler than I had anticipated.
Following your advice, I was able to get niml datasets for the "region-wise" data with p and q values, after doing 3drefit -addFDR data1.niml.dset
Then I just did
3drefit -copyaux data1.niml.dset data2.niml.dset
3drefit -copyatr data1.niml.dset FDRCURVE_000001 [etc etc] data2.niml.dset
This transferred the stats information w/ FDR correction from my "region-wise" data to my "viewing" datasets on the high-res surfaces.
Thanks for the help, Rick.
Best,
John