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Hack to reuse a ā-cā case to run multiple experiments used in MVK and PGN tests does not work. For TSC, during the RUN phase, the user_nl_eam_???? ensemble member namelists will be created anew by cime/scripts/lib/CIME/SystemTests/tsc.py. This script can be edited to append user_nl_eam to each user_nl_eam_???? file, and then one can set parameters in user_nl_eam.
link to PASS/FAIL post processing script:
https://github.com/LIVVkit/evv4esm/blob/master/evv4esm/extensions/tsc.py