To answer my own question..... yes this route is possible. The paths are generally narrow tracks and often quite indistinguishable from the surroundings at times. Hence the reason they do not show up on aerial views.
Yesterday I walked from Caw Fell to Seatallen, turning downhill from just South West of Little Gowder Crag (following advice from a bloke I had chatted to whilst walking from Haycock to Caw Fell). The scree is easily avoidable and the route brings you to the cairn that AW mentions to look for that is meant to indicate the start of the the grassy ascent up Haycock on the SW face/ hill side. Eventually bringing you to High Pikehow.
Oh yes...... It does help if your left leg is much shorter than your right leg for a good portion of the walk too if going from Caw Fell to Seatallen
Subsequently I had two groups of people asking me about this route whilst ascending and descending Seatallen