So, a couple of thoughts, in case there's still an interest.
1. The 02+ QX4s actually did come in tan with the newer wheel style. You can see pics in the thread I linked to at the bottom.
2. The similar-year I35s also came in tan with the newer wheel style. I'm about to buy one and try it out.
3. There are steering wheels like yours (non-wood) that are heated. Kinda hard to find, but they're out there! They come from I35s exclusively, I believe. No idea how hard that is to get working.
4. If the center is just getting worn out, you may consider re-painting it. Apparently there is airbag paint out there that's made specifically for the purpose.
5. Since you have a Pathfinder and therefore a Nissan logo in the middle, the airbag from a similar year Maxima may suit you better:
I'm having a similar adventure:
2002-qx4-steering-wheel-swap-t583379.html