What part do you need from PresentationSource?
The CompositionTarget, so you can register to the Rendering event?

In Noesis that event is part of the View that holds the UI tree. You can do:

someControl.View.Rendering += (s, e) => { // do something };

Actually I'm doing this:
(I'm not 100% sure this even makes any difference in a game but... I'm using it in a decorator to compensate in case LayoutRounding is active. Maybe Noesis already compensates for that?)

    private Size GetDpi()
    {

#if UNITY_5_5_OR_NEWER
return new Size(One, One);
#else
var source = PresentationSource.FromVisual(this);

        var dpiX = One;
        var dpiY = One;

        if (source?.CompositionTarget != null)
        {
            dpiX = NinetySix * source.CompositionTarget.TransformToDevice.M11;
            dpiY = NinetySix * source.CompositionTarget.TransformToDevice.M22;
        }

        return new Size(dpiX, dpiY);

#endif
}

Actually, I just saw since Framework 4.6.2 this has been added
VisualTreeHelper.GetDpi(Visual visual)

Is that implemented in Noesis? If it is, I'm not going to need this I think