I think fans would be fine if she just wandered back into the square.
Pat: Alright Roxy luv, how you doing?
Roxy: Pat? but.... I thought you were dead.....
Pat: No dear. Doctors told me I had cancer and there was nothing they could do. I was all prepared for my death when they rang up and told me there had been a mistake, it was Pat Kutcher that was dieing, not Butcher. Anyway, Derek Branning being back in the square terrified me, so I persuaded Bianca to just help me fake my death as planned and I went of to New Zealand. When Simon came to meet me at the airport he even popped some flowers on my grave to to make it look real.
Roxy: But what about the kids? They grieved you
Pat: I couldn't risk derek finding out. I'm sure they will be pleased to see me though.
Roxy: What did Derek do that was so bad?
Pat: he raped me Roxy. Hes David's father...
Roxy: ah right, my dad did that to Stacey so she murdered him, I'm meeting her for drinks later, you should come for a catch up
Pat: oooh I'm gasping for a gin, I'll see you there love, just off to unpack now and tell the Butchers the good news.
(then everything simply goes back to normal)