That was just a modification of my first file … it’s just a different name so it doesn’t matter. Just put here how you named your file and you are good to go. Sorry for the confusion.

To address this definitively, you need to edit the target_unit value in [StdConvert] to “METRIC” or “METRICWX” . . . and then follow your steps in your section “Reset WeeeWX” again to nuke whatever data was already in there and just start recording metric values. Technically Weewx says it doesn’t matter what unit you use in the DB since the reports allow you to display any value type you want, but it makes no sense to convert and then reverse the process to leave you back where you started.
##############################################################################
# This service acts as a filter, converting the unit system coming from
# the hardware to a unit system in the database.
[StdConvert]
# The target_unit affects only the unit system in the database. Once
# chosen it cannot be changed without converting the entire database.
# Modification of target_unit after starting weewx will result in
# corrupt data – the database will contain a mix of US and METRIC data.
#
# The value of target_unit does not affect the unit system for
# reporting – reports can display US, Metric, or any combination of units.
#
# In most cases, target_unit should be left as the default: US
#
# In particular, those migrating from a standard wview installation
# should use US since that is what the wview database contains.

# DO NOT MODIFY THIS VALUE UNLESS YOU KNOW WHAT YOU ARE DOING!
target_unit = US # Options are ‘US’, ‘METRICWX’, or ‘METRIC’

I am not sure if I fully understand the question – sorry …