Hi Chris,
I'm afraid there isn't an easy way to do that within SPM. During spatial processing, SPM will modify the image headers of your original data files. Therefore, the original data need to be writable. This probably requires a r/w copy of your data prior to processing. If you are working with Linux or MacOS and your images are stored in hdr+img format, you may also try softlinks to the img files. The hdr files need to be copied, because they will be changed.
Volkmar
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