I think it would make more sense to try modding what you have rather than dropping a bunch of money on wood cups. I would personally give something like the markl mod a try.
If I were to mod a pair of D2000s, here is how I would probably do it (unless you're going for the open-backed mod):
1. Remove the stock dampening from the D2000 cups.
2. Line the cups with Dynamat Xtreme (you can get two 12" x 12" sheets for around $20, which is more than enough).
3. Line the top of the Dynamat with Paxmate (newest/best version) or Silverstone acoustic foam (pretty cheap on Amazon for a whole bunch of it).
4. Place Dynamat on the back of the driver magnet/housing (like the markl mod). You may also want to consider covering this Dynamat with the acoustic foam as well. If you do, just make sure it isn't covering any
"breathing" holes on the back of the driver.
5. Line the front side of the driver baffle with Dynamat. There is a stencil floating around for this somewhere. I personally was never able to get this right...it's not easy!
6. Try the earpad stuffing as seen in the markl mod. Alternatively, Lawton Audio has their new angle pads for the Denon headphones. If they are anything like the J$ pads, they should provide more refinement to the sound overall.
7. (Optional) If you find them to be too bright or sibilant, try experimenting with various open foam material placed directly in front of the driver. I trimmed off the edges/flaps of my KSC75 earpads and placed that in front of my D2000 drivers.
8. (Optional) Recable them! The stock D2000 cable can be improved upon. Personally, I prefer the stock cable. My Mogami 2534 replacement cable made my D2000s more sibilant to my ears.
So, more or less, I'm recommending you try a slightly modified version of the markl mod. The main difference here is the acoustic foam you'd be applying on top of the Dynamat. This is primarily to prevent unwanted acoustic reflections, aid in sound absorption, and help dampen the cups just a tiny bit more. The Dynamat + Silverstone acoustic foam has been a very solid combo for me when modding headphones.
The stock dampening in the D2000 isn't that impressive. The Dynamat + Silverstone acoustic foam combo should be provide a more refined sound. If you check out the D2000 graphs on Innerfidelity, the J$ pads seem to help even out the sound signature overall. I think the LA angle pads + mods I've mentioned should keep the original sound signature intact while providing refinement all around.
Just a guess, though. I'd try these on my own D2000 if I hadn't turned them into open-backed headphones!