Well, from what I remember, Ebon Hawk in KOTOR 1 was pretty much similar. You can try finding the name for Kotor 1's Ebon Hawk texture and try replacing it with HDTP one. It could work (but DO compare the textures just to be clear).
1. Extract KOTOR1 EbonHawk texture (maybe it's of same name as texture file in HDTP).
2. Open it and see if it's similar to one in HDTP.
3. Try replacing it the same way as Kotor 2 and see if it works in-game.