Restrictive wikis for captchas are only a handful (plus pt.wiki which is
in "permanent emergency" mode).
<https://meta.wikimedia.org/wiki/Newly_registered_user>
For them you could request confirmed flag at
<https://meta.wikimedia.org/wiki/SRP>
Personally I found it easier to do the required 10, 50 or whatever edits
on a userpage. 5 min at most and you're done.
Nemo