It should be really helpfull to enable dynamic settings in override condition, like :
ezpublish:
system:
site_group:
location_view:
full:
my_override_condition:
template: "@ezdesign/full/myGenericTemplate.html.twig"
match:
Id\Location: $locationId;acme$
and then, you just have to defined your dynamics settings for all your siteaccess in parameters.yml
parameters:
acme.fre.locationId: 123
acme.en.locationId: 456