It would probably help if you compared the apache configuration that is produced with and without the listener files.
By the way: As for my setup, Firefox and Chromium ignore the HSTS-Header when using http, so you also have to redirect all http traffic. https://tools.ietf.org/html/rfc6797#section-7.2
Subdomain
For the opening of a new domain, which isn't reachable not yeat over the the 'domain.tld' we have a the Alternative URL like 'vu20xx.....' to open it.
The same funstionalitity would be usefull for subdomains.
this feature also already exists, but it is "hidden", the interface propagates only the temporary url for main domain, but not for aliases or subdomains.
in the apache host files every subdomain and alias does have a ServerAlias entry for temporary url like this (the number is the id of subomain or alias)...
vu2003sub5.serverhostname.tld
vu2003als2.serverhostname.tld
the local nameresolver also has the records for this temporary urls (in the serverhostname zone). so you only need to know the id of your subdomain or alias and your (external) nameserver, which is responsible for the serverhostname domain, should have the wildcard record enabled
should have the wildcard record enabled
must have the wildcard record! Otherwise it will not work.