This is a guess but, if you have a dedicated bassline, HP filter the Piano at at least 125hz, you could record it to audio and then try something like BBE Sonic Maximizer to enhance the high end, this will bring out clarity without introducing harshness. If you opt for EQ, be sure to use a good quality linear phase eq.
I think breal hit the nail on the head there though when mentioning the mix. To really make it crisp and noticeable, you simply have to make room for it in the mix, that means being aware of the frequencies that you want to 'leap out' and cutting them from other instruments.
You can also 'push' things back into the mix with the use of transient designers. taming transients has the effect of making a sound seem 'softer' and thus, more gentle and less upfront. Couple this with a suitable reverb type and you'll achieve a sense of it being set back. This should help to keep the focus on the Piano upfront and providing you have made mix-space for the high end, you might not need much enhancement.
Some Pianos are simply dull and not too bright anyway, so at least have something which is pretty close to begin with.