IC to replace 4 FETs (switches)?
I am not sure if this is what you are looking for but if it is simply a space problem then the smallest you will probably get is a simple tri-state buffer. Here is an example: http://www.ti.com/general/docs/lit/getliterature.tsp?genericPartNumber=dm54125&amp;fileType=pdf
I have never personally used this model so do some more research before actually putting it in something but this is my nudge