Mandating it doesn’t seem to be consistent with individual liberty, though.
Forgive me for being pragmatic about this, but if this was such a good idea and consistent with the interests of the people, you wouldn’t have to mandate it. This is how things would be done.
The only system compatible with full liberty is anarchy. But you stated that economic democracy is libertarian, and then proceeded to call for it to be mandated. Mandates are authoritarian, not libertarian.