viur-core >= 3.6: How to make parts of the config available to the client?

[phorward]

In the past, it was possible to simply provide some keys starting with "admin." to the conf-variable, to obtain them via /vi/config.

This is not possible anymore since viur-core 3.6, as /vi/config now only makes the content of conf.admin available to the client (see here). There are ways to hack it, but nothing is really nice. Therefore, a solution must be created, or a standard way to go.