This won't work because omxplayer won't follow it: it will show the new time (position), but not start the video in each new position.
Simple test: run a video and keep the right arrow key pressed.
Minimal Kiosk Browser (kweb)
Slim, fast webkit browser with support for audio+video+playlists+youtube+pdf+download
Optional fullscreen kiosk mode and command interface for embedded applications
Includes omxplayerGUI, an X front end for omxplayer