I worked with Theme Engine and Skin Engine from KSDev with great success, although, unlike what you wrote, it worked in search for me.
I personally found that the skin editor was a pest for work, it was full of mistakes, at best unstable, knew little about documentation, but even more stable than the skin editor from Skincrafter.
As an alternative, I know a skin component called Alpha Controls , however I have not tried it myself, Skin Crafter , whose editor I briefly mentioned above, also has a skinning library, my personal experience with this, however, is not the best.
I did not try the VCL skin that PRUZ mentioned about itself, so I can not compare these engines with it, we briefly looked at its specifications when we were looking for skin libraries for our application, but its lack of transparency was too much of a burden designers * sigh *. In any case, I just wanted to give you additional alternatives if you need to.
source share