Will a gift that allows a Lesser Change of Self fool the Sight?
After some digging I found the following from Jenna Moran:
This isn't spelled out anywhere, but if you look at the description of the Sight on p. 87, and at the various examples that mention the Sight, all instances of the Sight failing involve something extraordinary, whether deliberate effort or fundamental to the object.
The entry on the Sight mentions that Excrucians and some Powers have the ability to conceal themselves from the Sight:
The Unblemished Guise sample Gift is described a way of hiding one's supernatural nature from the Sight by use of a Lesser Creation of Illusion:
Incomprehensible Imperators grant their Powers invisibility to the Sight because
Notably, a Major Change of Appearance can deceive the Sight:
What can be gleaned from all this is that a lesser Change of Self is likely not powerful enough to fool the sight, but more to the point is not the right kind of miracle/Gift to hope to deceive the Sight. Only effects that are inherently deceptive through directly altering their spiritual Appearance (hence their Appearance to the Sight) or by deliberately masking their nature through Illusion will fool the Sight. Those miracles and Gifts that do fool the Sight deliberately aim to do so.