Hey,
I would use the trap wire that is run through the front beam for crew only. Your right, it will pull forward some, it will also put excessive strain and wear on that shockcord to be used far back, by the skipper all the time. It's not a big deal to be used by the crew as your not usually that far back. It's actually a nice place for the crew because it keeps it just out of the way but still there to grab and get out on the wire.
I have a few pictures of my 6.0 that I am selling on webshots. Here is the link to one and if you zoom in by the sidestay you can see a green shockcord coming out of a grommet in the tramp through a fairlead then to the trap wire. This is what I have found to be the best placement for a skipper's trap wire.
http://good-times.webshots.com/photo/2007120260095730281vaKGaL

So you'll need a grommet in the side of the tramp and a fairlead on the edge of the hull on each side. The shockcord for the trap goes through the fairlead, through the grommet, under the tramp and back out the grommet on the other side and out the fairlead. Either add a 2nd wire and use this or use the single wire in this location.
-Todd

By the way.. are you the same one that posted the pictures on the facebook group, "you might be a college sailor if..."? I wish I could get more college kids to sail cats... out of the 40 kids on my sailing team 1 has a old school Tornado and none have ever raced one.