Wouter I see a couple of issues with your idea (if I've interpreted it correctly, that being that the mainsheet runs along the tramp to the back beam).

1. As you ease the traveller, you system will require you to ease the mainsheet (more so than the "normal system).

2. the block/ratched fitted to the tramp will be in a basically horizontal orientation when in operation. You might find you send a lot of time controlling the "flop over" of this block or that the main regularaly requires fliping or untangling after a tack/or gybe.