I agree this would not be an “out of the box” solution to the requirement, but I belief combining the two approaches would be a possible course of action. Let me elaborate:
The CAcert.org “web of trust” is based on “human beings validating each others identity”. As your screenshot shows, there is some 350.000 legally verified users (that means: another user, who has previously been verified by yet multiple other verified users, has (in a “person-to-person physical meeting”) reviewed the persons legal documents - like passport, ID card, driving licence - and considered them “being consistent with the person presenting them”.
You are right, currently there are “only” about 18.000 people (worldwide) who can actually do this validation. But putting the two projects together, we might indeed have a exponential jump in numbers of “validated users”. The assurers in CAcert web-of-trust do work voluntarly, so there is no cost involved for “saleries” here.
As you might have figured, I am indeed such an “assurer” for CAcert.org, and there is a substantial number of others for example here in Vienna, Austria. And I even went through the process to receive an extended validation for my own domains with CAcert.org
So I would be quite happy to act as an “liaison officer” between the two projects, if this is considered a possibility by LE.
And with “verified assurers” around the globe, it should eventually be a doable task to establish a network of trusted people to validate the EV requirements.
From an technical point of view, an API could be implemented between the CAcert.org assurance interface and LE, so this should not be an (showstopping) issue.