This is a fairly common way to attach the jib fairleads on the Australian sloop Mosquitos. The tramp is definitely strong enough (if you can stand on it you shouldn't be able to pull it apart with a 2:1 jib sheet). I've seen two setups, one is a row of eyelets with rope threaded in-and-out through them to give a row of loops to attach the fairleads to. The other is a piece of narrow webbing stitched to the tramp to make a row of small loops.
In both cases you can easily move the fairlead position while sailing.
Also the row of loops is usually placed at an angle so as the fairlead is moved inboard it also moves forward.
Hope this helps.
Tim