If you wanted to extend from Hope Cross, IMHO you would be better continuing down the Roman Road into Hope, turn right, along the road and up past Jaggers back to the cross. The Roman Road is a better decent than Jaggers.
Better still would be go past Derwent Damn from the start at Fairholmes, along the NE side of Ladybower and up Derwent Edge on the flag stones (this is a tough climb all the way to the top). Get to Whinestone Lee Tor and drop back down to the back of the Ladybower pub (there is a sneaky one straight on at the junciton at the top or a longer BW that heads east then doubles back on itself to the pub. Anyway, cross the bridge towards Bamford and head for Aston, turn R past Twitchhill Farm and past Hope Brink (both named on the map) and climb back to Hope Cross, then decend the Roman Road to the bottom of the Lockerbrook climb and back to Fairholmes.
You should be able to do the whole thing in 2 hours ish.