When you say 2015 Mondeo, do you mean a MD (Mk5)? I thought all MDs landed in this country with left-hand wipers/right-hand indicators?
Check out this thread from user Luketapp, who did the mod you describe on a 2011 MC (Mk4) Mondeo. He used the stalks from a 2012 Focus and it turned out to be pretty much a plug-and-play swap:
https://fordforums.com.au/showthread.php?t=11469974
This got me to thinking about doing the same mod to my MC from an MD with the lane departure control on the stalk. The MD stalks look the same as the Focus so I think the odds are good that the designs will be a compatible swap, but the only way to find out for sure would be to try it...