Cwmystwyth, Graig Ddu, and Domen Milwyn
The walk could be suitably shortened by starting and finishing in the village of Cwmystwyth. However, at the time of writing, parking is exceedingly difficult in the village. You could obtain permission of a householder to park on the verge near their house. Another alternative may be the hard verge alongside the very small lane that leads down to the bridge, although I haven't yet tried this. Parking where the Start and Finish are shown , below Graig y Ddalfa on the north side of the river is reliable and free, but adds 2.5-3 km to the total distance of a tough walk. However, this is a magificent walk, and well worth the difficulties.

Cwmystwyth, Graig Ddu, and Domen Milwyn