Sounds like a startup idea, make privacy with CA transparency easier.

You might start a CA without transparency. Browsers would not include it by default, but at least you would only have to install it once and wouldn't have to run a CA yourself. (Or a CA service that would give everyone their own CA - I suppose these exist but there might not be a SOHO targeted one).

Or you could make a DNS zone provider that by default sets up a bunch of nondescript domain names with LE integration, so outsiders can't tell their purpouse or activity level from the CT log. This could also be sold to the router/printer vendors as the vendor-provided DNS, advertising that it's GDPR compliant.

Or put everything behind the same domain name, with different services using different ports.