A FOSS browser extension developed and maintained by a non-profit organization, vetted/audited by other trusted third party entities can facilitate convenience in this flow, bringing the overall experience closer to a desirable state.
The websites which are to be restricted by government-imposed legalities can expose the claims they need during their registration/verification process and the browser extension can automatically retrieve those claims alongside other details as mentioned previously, and can auto-fill on the website for the user.
Since this extension acts as the intermediary client, it knows the parties involved but it preserves user's privacy accordingly due to its vetted nature and as a FOSS application.
Of course, there will be concerns regarding pushing people to use such things but if legality can force people to give out their credit card details on certain websites, then it can also push for such user-focused convenience ways to enforce the legal matters. Whether it will really happen is not in our power but technically it is a resolvable matter as put forth by the original comment.
The websites which are to be restricted by government-imposed legalities can expose the claims they need during their registration/verification process and the browser extension can automatically retrieve those claims alongside other details as mentioned previously, and can auto-fill on the website for the user.
Since this extension acts as the intermediary client, it knows the parties involved but it preserves user's privacy accordingly due to its vetted nature and as a FOSS application.
Of course, there will be concerns regarding pushing people to use such things but if legality can force people to give out their credit card details on certain websites, then it can also push for such user-focused convenience ways to enforce the legal matters. Whether it will really happen is not in our power but technically it is a resolvable matter as put forth by the original comment.