Have a look at TUSQ pins - designed to imitate both the hardness and density of ivory. Try here www.musiciansfriend.com or Google for a couple of well-written technical articles.
I tried them more out of curiosity than anything on my 00028, and yes, they did make a difference, albeit small. I wouldn't expect anything really radical, but there is better sustain in the top end and a slightly brighter tone overall. The guitar sounds better balanced than with the factory pins, though again, this is very subjective: fifty-odd year old hearing vs. forty years playing...
As they were only around £16 a set, I would say they're worth the experiment.
Chris