It's deceivingly simple, Eric:
IDL> SAVE, my_mrf_template, FILENAME='/path/to/my_mrf_template.sav'
Then, any time you need it, you can just run:
RESTORE, '/path/to/my_mrf_template.sav'
and your next read command will correctly process the keyword setting "TEMPLATE=my_mrf_template".
J3
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