remap.sh

#!/usr/bin/env bash
# To run at startup:
# sudo defaults write com.apple.loginwindow LoginHook `pwd`/remap.sh
# https://developer.apple.com/library/content/technotes/tn2450/_index.html
CAPS_LOCK="0x700000039"
ESCAPE="0x700000029"
NON_US_BACKSLASH_PLUS_MINUS="0x700000064"
GRAVE_ACCENT_AND_TILDE="0x700000035"
SLASH_PIPE="0x700000031"
ENTER_RETURN="0x700000028"
RIGHT_SHIFT="0x7000000E5" #Do nothing button
FROM="\"HIDKeyboardModifierMappingSrc\""
TO="\"HIDKeyboardModifierMappingDst\""

hidutil property --set "{\"UserKeyMapping\":[
{$FROM: $CAPS_LOCK,                      $TO: $ESCAPE},
{$FROM: $ESCAPE,                         $TO: $RIGHT_SHIFT},
{$FROM: $GRAVE_ACCENT_AND_TILDE,         $TO: $SLASH_PIPE},
{$FROM: $SLASH_PIPE,                     $TO: $ENTER_RETURN},
{$FROM: $NON_US_BACKSLASH_PLUS_MINUS,    $TO: $GRAVE_ACCENT_AND_TILDE}
]}"

Hm, don't know how to help you. The table provided in the technotes doesn't have Fn listed