Bumpitybumper
What you are proposing might help a tiny handful of people who have partners who like to rehash conversations with a written follow up.
But for the most part all it would do is allow a muddying of some already murky waters due to misinformation.
If the reality can be as clear cut as
willingly enter into a legal contract (marriage civil partnership, private contract sorted out by solicitors and signed by both parties) or forgo the protections and responsibilities proffered by those contracts
but has become misunderstood by far too many people as
living together with a kid is basically the same as being married legally in terms of protections and responsibilities
..lthen how much harder will it become to inform and persuade people of the reality if there are Chinese whispers of some case somewhere where one partner got half the house that belonged to the other partner cos the judge said living together means you have rights.
For each person helped how many more will be even less convincable of the need for marriage (or alternative legal contract) in order to access its protections and responsibilities ?
A more effective way to avoid human pain and suffering in the face of verbal broken promises (or assumed unspoken promises) might be to create a simple, clear cut message aimed at eliminating misinformation.
And push it out on SM and youtube, using their magic demographic algorithm thingies, so we don't get another generation making choices without understanding the black and white consequences of said choices.
That doesn't need the time suck of getting the state, or the legal system, involved. It could be crowdfunded and people with media/technical talents could donate their time/efforts to save as much money as possible to pay (hopefully a reduced PSA rate) to push it out on SM/youtube. I'm no expert but I think that at least has the potential to help more people, much faster, especially if aimed at those who are unlikely to have already shacked up and started a family because they are still a bit too young for that.