I’ve been up and down the NE ridge of Irvine a few times, the most recent being
a year ago.And I’ve been up the chute from Meysan Lake to the Mallory-Irvine bowl twice, but never down. There is a very steep and loose section from
the top of this chute (bottom of the Mallory-Irvine bowl) over to Mallory—so be careful on this.
There is also the option of going up to the Mallory-LeConte plateau from Meysan Lake, but it is very, very, tedious without snow.
I have quite a few pictures of those climbs, but they’re not uploaded. (Actually, I do have one album on Winkflash, but I really haven't figured out how to use it. Try
four years ago. You may have to register with Yahoo.)
So my take is: (1) The NE ridge of Irvine is really fun, going up or down. Class 2, and easy 3 in just a few sections. (2) I didn’t think the chute to the Mallory-Irvine bowl was that bad. A little loose in the lower chute, but the part I most disliked was negotiating the giant boulders at the bottom of it. Once above that little waterfall (the only class 3 move on this route) it was good going. (3) I would avoid going up to the Mallory-LeConte plateau this late in the season.
Bottom line: The way you propose is fine, but in my opinion, the reverse is equally good. Just be careful on the traverse to/from Mallory.