FWIW, my take: get rid of the bike (or keep it as is), and purchase something suited to your current needs/wants (e.g. a bike w/flat bars etc.).
Why? Two reasons.
1. The cost of doing the conversion to flat bars w/appropriate controls is excessive given the value of the bike. This multiplies if you start doing things such as switching out forks for a 'cross fork w/canti mounts. The latter brings me to my second reason.
2. The geometry will never be 'right': i) The Trek's geometry -- especially the effective t/t length -- is suited to drop, not flat, bars. You can bodge it with silly stems etc., but it will still never be right, and ii) putting on a 'cross fork will simply even further mess up the geometry and handling (fork rake/trail etc. will all be wrong).
Sorry, but I just can't see the point at all, especially when there are so many good, affordable modern road-oriented bikes around intended for use with flat bars and disc/v-brakes if that's what you want.