In reply to Mr Lopez:
Did it in 92 using the Piola topo , this was spot on from what I recall, a 25 m ab off the Welzenbach and 20 m ab off the Bich ( just checked the battered and taped up 1986 guide, water damaged from other adventures but not this one blessed with perfect weather ).
These two abseils are most probably far quicker than scouting for alternatives , unless you are trying for a free ascent?
On the descent also , a quick short ab or two were often easier than looking for alternatives.