While exploring write.config.BASGRA and write.config.SIPNET as part of
my interest in Project 4 (Standardizing Model Couplers) for GSoC 2026, I
noticed both functions contain identical blocks for:

1. Loading the job template (template.job)
2. Building hostsetup from settings$model$prerun and settings$host$prerun
3. Building hostteardown from settings$model$postrun and settings$host$postrun
4. Applying common substitutions into job.sh:
   • @HOST_SETUP@, @HOST_TEARDOWN@
   • @SITE_LAT@, @SITE_LON@
   • @START_DATE@, @END_DATE@
   • @OUTDIR@, @RUNDIR@

These could be extracted into a shared helper function (e.g. build_job_sh())
in a common location, reducing duplication and making it easier to add new
models consistently.

Is this a good direction to pursue? Happy to start with a draft implementation
if the team thinks this is worth addressing.