Value education has been attempted many times, in many forms, across many schools and many decades. Ask what it actually produced in terms of lasting inner change, and the answer, for most versions, is disappointingly little.
Some versions turn abstract, offering words like honesty and kindness with no real anchor in a child's actual experience, nothing to test the words against. Some turn parochial, tying values so tightly to one particular tradition that they cannot speak to anyone outside it. Some turn moralising, delivered as a list of shoulds from an authority figure, absorbed the way any lecture gets absorbed, half listened to and quickly forgotten. Some are purely faith based, powerful for those who already hold that faith and largely inaccessible to anyone who doesn't.
A genuine alternative, if one is going to work at all, needs to clear five specific bars. It has to be universal, secular, natural to existence itself rather than dependent on believing something first. Eternal, not tied to a particular era's fashions. Communicable, addressed to reason, something that can actually be explained rather than just felt or revealed. Liveable, workable in the actual friction of an ordinary day rather than only in ideal conditions. And verifiable, testable by anyone through their own experience, not simply taken on faith from an authority.
Most attempts at value education fail one or more of these tests quietly, without anyone noticing at the time. A value taught only through fear of punishment evaporates the moment the punishment is no longer likely. A value taught only through reward for good behaviour evaporates the moment the reward stops. The only version that seems to hold is one a person has actually verified for themselves, tested against their own experience, and found to be true independent of anyone watching.
That is a much higher bar than most classrooms are built for. It is also, apparently, the only bar that actually works.