A way to override property in umbraco

OverriddenPublishedContent.cs

// source: https://www.formfakten.de/themen/2018/08/published-content-with-overridden-properties

public class OverriddenProperty : IPublishedProperty
{
    private readonly string alias;
    private readonly object value;
    public OverriddenProperty(string alias, object value)
    {
        this.alias = alias;
        this.value = value;
    }
    public string PropertyTypeAlias => alias;
    public bool HasValue => true;
    public object DataValue => value;
    public object Value => value;
    public object XPathValue => null;
}

public class OverriddenPublishedContent : PublishedContentWrapped
{
    private IPublishedContent _mirror;

    public OverriddenPublishedContent(IPublishedContent mirror, IPublishedContent content) : base(content)
    {
        _mirror = mirror;
    }

    public override ICollection<IPublishedProperty> Properties
    {
        get
        {
            return base.Properties;
        }
    }

    public override IPublishedProperty GetProperty(string alias)
    {
        if (alias == "Theme")
        {
            return this._mirror.GetProperty(alias);
        }
        return base.GetProperty(alias);
    }

    public override IPublishedProperty GetProperty(string alias, bool recurse)
    {
        if (alias == "Theme")
        {
            return this._mirror.GetProperty(alias);
        }
        return base.GetProperty(alias, recurse);
    }

    public object GetPropertyValue<T>(string alias)
    {
        if (alias == "Theme")
        {
            return this._mirror.GetProperty(alias).Value;
        }
        return base.GetProperty(alias).Value;
    }

    public object GetPropertyValue<T>(string alias, bool recursive)
    {
        if (alias == "Theme")
        {
            return this._mirror.GetProperty(alias, recursive).Value;
        }
        return base.GetProperty(alias, recursive).Value;
    }
}