How to add new Civ icons to the Loyalty lens?

[Barbarian King]

I have had a difficult time figuring out how to get the icons for new civs I've made to show up on the Loyalty lens, so I though I'd ask here and see if anyone knows how to do it? I've successfully added the regular civ icons to the mod (those that show up on the city banner, in the civilopedia, etc.), but have had no success with the lenses. So far I've made pressure icons of the same dimensions as those found in the SDK assets, I've added them to the mod via xlp (as class StrategicView_Sprite), I think I've done the proper artdef work by adding a StrategicView type artdef and filling out the "UILensEntries" and "UILenses" portions in imitation to how Firaxis did so on their StrategicView_Shared.artdef file, and I've tried to add the whole thing to the mod via the mod's Art.xml file by adding artdef entries under "StrategicView_Sprite", "UILensAsset", and "Overlay" and adding blp entries under "OverlayTexture", "StrategicView_Sprite", and "UILensAsset". Any help in pointing out what I've done wrong or what I've omitted would be appreciated.