Open the exterior main textures (Yak52_Main.dds, Yak52_YT_Main.dds, Yak52_1POLET_Main.dds, Yak52_Main_ST_BL.dds, etc.) in the Yak-52 library with GIMP, etc. Overlap the Adjustment Layer as a layer, merge the images, and save them as DXT5 DDS, with MIP.
The strength of the texture adjustment should be changed by the transparency of the layer.
update 11/16/2022 - minor revisions