<working at being clear as...>
Short take: Nope
The thing is, that (I believe) the TXI hack still cascades through the PLT, so any alpha in the redirected texture will fall through the original PLT to the chrome layer. That is the redirect overlays the redirected texture on top of the PLT layers so all the non-alpha pixels hit the new texture, but alpha falls through.
Did any of that make sense?
Now, the cloaks had that problem until 1.68 or 1.69, I think, when Bioware added a toggle in the 2DA for alpha/envmap. But applying the same kind of shader pipeline to bodyparts isn't possible afaik in an un-hacked nwn.
<...metal>