Piano/kerboard effect?

There are MIDI guitar controllers that will allow you to get synth and keyboard sounds but MIDI playing requires crisp, disciplined technique - sort of goes against the free expressiveness of electric guitar. I would say if you want a piano sound then simply learn to play one there are some very, very good piano emulating keyboards that don't cost too much.

You can make your playing more piano like by stiking the notes clean and damping them as you play so nothing rings out too much. The sort of playing you get in the classical fingerstyle tradition.