Is it possible? I haven’t seen either story in ages (especially The Stolen Earth/Journey’s End; it’s been around 7 years since I’ve seen it), so I don’t remember the specifics, but could they be combined in a cohesive way? I wouldn’t want to significantly alter continuity so we would still get the meta-crisis, and there’d need to be a time gap for the Doctor to go solo for the Specials beforehand. I just feel like the finality of Journey’s End makes it a fitting end for the Tenth Doctor, rather than dragging out the end of his run for a measly four more stories. Besides, The End of Time is so stuffed with filler that we shouldn’t lose much. Basically, this story would have both the Time Lords and the Daleks returning, so something, something Time War. Maybe the Dalek fleet escapes the Time War through a portal rather than having simply survived it. Once they’ve finally been defeated, the Time Lords show up through that same portal, and we get the ending of The End of Time. This means the whole white point star/drumming link thing would either be dropped or the daleks somehow get through the portal first. The Master could be revived at the start, but he would need to be kept busy while the Dalek invasion takes place.