I'll disagree. A 40/42 middle ring is perfect for hills around here, so much better than bunny hop shifting around a 34 chainring. The 28/30 is a bail out or uber hill ring. It simply works, especially with a narrow range cog on the back.

I've converted a double to triple without much drama, but the spindle, FD/shifter was spaced to handle a triple. New RD and chain besides the crank, that was about it. It's very possible you are going to have to replace most of the drivetrain and L-shifter. Did the 2013 Trek Crossrip E-Leet come as a triple? If so, what components changed the configuration? Visit a Trek dealer.

Simpler, just dump the compact for a regular double. Maybe change the rear to a 26 max cassette. Just get rid of those wide-range gears, you're done.