Populated by academic experts on "civilization" I suppose? In the transitional phase, when you do not yet have generations of products in a reformed academic system, that also deconstructs its own academic false constructions of culture - you will have to rely on existing "products" - which will be full of Thaparites and will be NAC II.A committee would consider whether the submissions meet the criteria of being indigenous elements of our civilization.
Yes, suppose in the example I have given above of legalized marital rape - is claimed to be part of "indigenous culture" of one indigenous culture out of the million diverse cultures all of which must be protected in India. I am sure you realize that both Islam and Christianity will have to be declared indigenous - under current thinking?Citizens should be able to approach an "Indian Commission for the Preservation of Indigenous Culture" and lodge a complaint if some process or group tries to "destroy" these cultural elements, by either talking people into ignoring them or doing away with them or speaking ill of these elements for the purpose of terminating their upkeep.
The state pretends or spokespersons of the state pretend [or they perhaps genuinely believe] that "cultural" elements are all mythology, and somehow the state is independent of "culture". It is impossible for a state to be completely value-less, because in that case it cannot evaluate between contesting claims or positions. If the state is also an arbiter between contested positions, it needs a third comparator value-system. Or it has to develop one to remain functional.India is the national embodiment of the Indian Civilization. The cultural elements addressed earlier belong to this civilization. As such India is the preserver, the protector of all the culture from this civilization. It is simply India's responsibility. It belongs to what a state, in this case India, holds dear, things like - territorial integrity, sovereignty, self-sufficiency, market access, law & order, ideological fidelity firewall, indigenous culture, linguistic health, etc, and needs to protect. Preservation of culture is a secular responsibility. It has nothing to do with faith, belief systems, religion or anything.
For the faithful, many aspects of the religion would be a matter of faith, while for the state these are cultural elements only. For the faithful, it would be theology, while the state deals with it as mythology. The state is only interested in the form and symbology, while the faithful are interested in the essence. This allows the state to remain secular and still act as protector of cultural heritage.
This is where we should be aware of what value-system is used by the current Indian rashtra. It does intervene in "cultural" practices, doesn't it - but what it chooses to intervene in, and what it does not, should show you what value-system it follows. The simplest example would be the very early obsession in the new post-Independence rashtra to "reform" the Hindu onlee - and no reform at all, even when legal cases and precedences continue to arise - to reform the Islamic or the Christianity. Courts intervene to define "Hinduism" and "Hindu culture" as pure "tolerance onlee", and the rashtra does not intervene - but when it is about contravening Shariati claims, and judicial activism dares to intervene to change it as in Sha Bano case - the rashtra promptly intervenes to delete such interventions.
This shows what value system is currently followed, in which Islamic or Christian values take precedence for the rashtra over the Hindu.
The pretension of equi-distance in the Constitution is a legacy of imperial pretension, by which one particular post-"enlightenment" European Christian value-system underlay as the comparator to evaluate all else. Because the Constitution formally tries to preserve certain value-systems more than others, and is derived from a continuity of formal ambience of neutrality towards all religions while actually allowing selective special preferential treatments - it shows up the original biases in how it orders the preferences. In that, the Abrahamic memes are preferred - which are therefore protected more, even under a bluster of propaganda about modernism and "humanism".You are welcome to do so. However I feel, dharma/religion is best protected if it is done by the society and the state is left out of this. The state should keep its distance from religion. That is my personal view. Of course the Constitution is free to built using the essence of the teachings, as long as one can argue that those values are universal.