Wisest choice is to climb the couloir in the morning, and start skiing just as the sun heats the top part enough to be edgable. Crampons + two ice axes are needed for the short icefalls, they aren't very difficult but steep (60-70°), and none are good places to slip. These cruxes can be skied by a confident freerider and have good openings below to dump speed after the drops. Not really a place where you'd like to set up a rappel while the couloir is quickly heating up and snow is deteriorating.

Skiing it onsight could (probably) be done, either by rappelling into the starting col from the summit ridge (30m rope should be enough), or by sideclimbing into it from the lines lookers right, where there are some places you could either rappel or ski (very steep and likely icy), into the couloir around 30 vertical meters from the top.

Make sure to check conditions and size of the chokes with binoculars from below. Also note that this was skied during an exceptionally deep winter and is likely not in condition very often at all!