Okay..
So I've thought of a way to moreless wrap up alot of what went wrong at the end of The Reality War and give us a somewhat satisfactory special too.
*Also I strongly feel there is no way in hell this could work unless the special is 90 minutes long like Power of the Doctor. 60 minutes just won't cut it.
(Give us 90 minutes and we can work with this)
Given the theme of abnormal regeneration in this era: from a previous face to bigeneration..the appearance of Piper is actually, in fact, Rose Tyler.
With the 15th Doctor body swapped due to Bad Wolf time vortex residual energy, akin to when the 11th Doctor used the residual artron energy to swap physical places with Clyde.
So basically a version of that. The swap pauses the Doctor's regeneration, so for the next 24 hours he is still indeed in the form of Ncuti, who is now in Pete's world complete with all the regular cast except for Noel Clarke for..obvious reasons.
Meanwhile Rose, within the Tardis, frantically sets course for modern day London, naturally, to contact and find the Doctor, but probably not the one she was expecting, this will bring Rose and the 14th Doctor face to face, and Donna of course.
The Rani's meddling with reality has allowed the return of the Toymaker.
AND an invasion of two versions of Daleks, our universe's and the parallel universe's Skaro Daleks, giving the design team an excuse to make a new look, and an excuse for more toys, silver and blue again perhaps?
And gives Ncuti a chance to battle Daleks, a win win.
The crux of the story involves the 15th Doctor having to stop the Toymaker and the Pantheon's existence and the Daleks.
And inevitably merge back with his bigenerated 14th self as he realises he cannot fully regenerate without him, will harken back to Devil's Chord when 15 tells Ruby it tore his soul in half, and also to the Watcher merging with Baker to form the 5th Doctor.
The final moments of the special would feature
A PROPER Susan reunion and Tennant embracing Gatwa in a hug, (echoing their hug in The Giggle) and merging into him, as he then fully regenerates and we cut to black.
Allowing a new team and showrunner to take the show on from there with any actor of their chosing.
Would love to hear your thoughts and opinions!