So, how do you actually fake the cure? I remember the dialogue to tell them when you're on Tuchanka, and I didn't pick that because I'd planned on curing the genophage. And then there's dialogue to distract Mordin so he doesn't go into the Shroud. Do I just choose that and later convince him to work on the Crucible?
In my current playthrough Wrex is going to die and I'm not going to cure the genophage, but I want to make sure I get the highest EMS possible from those decisions.
To make sure Mordin survives sabotaging the genophage:
1) Do not recruit Wrex in ME1, or kill him on Virmire.
2) Destroy Maelon's research date in ME2, or don't do Mordin's loyalty mission (this results in the data not being mentioned).
3) Do no reveal the sabotage.
4) When you get to the Shroud, tell Mordin about the sabotage, then use a persuade option to tell him not to go through with the cure.