I had twin rear fog lights on my Rover, so no problem ! I also kept my speedo in km/h only, didn't seem to matter for the MOT ! I got the headlights from a scrap yard by the way !The simple answer is yes, having converted RHD to French LHD on several vehicles. the difficulty varied from unbolt/bolt on for a Suzuki Vitara to bumper-off on an MGTF.
One thing will surprise you - the cost! Don't know the cost of Duster lights but discount suppliers want £500 for a pair for my MGTF.
Another thing worth looking at is the rear fog light. Without trecking out to the barn I can't remember whether the LHD Duster has one or two rear fogs. I think it's one, in which case it will be on the wrong side and an MoT fail. Luckily for expats here in France it's only an advisory, so I have a stack of Vitara CTs (French MoT equivalent) telling me the light's on the wrong side!