Although it provides quick access to beer and pizza in Springdale, the Weeping Rock bus stop is one of the most arbitary places I can think of to end your epic traverse across the Colorado Plateau. Hayduke would have kept going and so should you. There still remains 35 miles of high quality but seldom used trail (apart from the Angels Landing access) for you to enjoy. Along the way you can detour up Angels Landing (maybe chuckling to yourself at how much gear tourists are carrying for a 2 hour hike), walk the West Rim which provides some of the best views of Zion Valley, enjoy panoramic views from the top of a cinder cone, and detour to Kolob Arch, the second longest natural arch in the world. All this and then end your HDT adventure at a stunning 360° view of the Kolob Canyons and the Basin and Range before you, from the very western edge of the Colorado Plateau. From here it should be an easy hitch to I-15 and perhaps to Hurricane or Springdale.
So take the shuttle bus into town if you need to resupply or sort out Zion NP backcountry permits, but I would highly recommend you pick up again at the Angels Landing trailhead, walk right to the very edge of the Colorado Plateau, and then perhaps yell "Hayduke lives!" This route extends the HDT by about 35.3 miles.