In order to get an amplified sound which has little to do with the instrument's natural acoustic, sad as it is, you will need a floating magnetic pickup which whilst not interfering with the natural sound will produce a signal you can mess with. A K&K will not do this completely as it relies on vibration to work.
To find suitable culprit look at the companies who deal with "soundhole" pickups (although you don't need one of those), Kent Armstrong or maybe a company like Seymore Duncan who produce an number of products you may like to consider . Baggs and possibly even Gibson will do as long as the signal is generated from the strings and not the body. It will, however, always sound like what it is to a certain extent, It'll never be a Telecaster!
