You want to fix THE TWIN DILEMMA?
Take the regeneration scene at the end of THE CAVES OF ANDROZANI, and use that as a CASTROVALVA-style reprise for the start of ATTACK OF THE CYBERMEN (an infinitely better opening story for the sixth Doctor). Done - no more nasty THE TWIN DILEMMA.
I remember that STRANGER video. I borrowed it once - out of curiosity. I had an idea it was going to be sh*t. Guess what? It was.