Welcome to the search...

+ Topeak Allay does have wider saddles and they are very T-shaped. However, the wider saddles are very, very soft. My experience (and, yours, of course may be different) as that the rear platform on the sport road model was so soft it was difficult to stay put on the rear platform. I waited expectantly for months for the saddles to hit the streets and harassed my LBS to order me one the minute I heard they were ready. Sigh....no luck.

+ Selle SMP Lady Strike may or may not work for you (Bike Mania and MasherZ both carry it). It is a little soft and, because it isn't a flat saddle, but, instead has a platform that is shaped kinda like /\ from behind--(very exaggerated), you might or might not find it good. If you try one, realize that you want the rear platform to be level when viewed from the side--that means its nose points up (like a Klingon Bird of Prey). The SMP does have a wide nose, though.

+ The Terry Rosie as mentioned above is on endless backorder. You might try getting an answer from Terry, but I'm losing faith. The saddle has been backorder listed for May 1, June1, July 1 and is currently listing July 25th as the backorder date. It looks like a very promising saddle--I just wish I could try it before Christmas....grumble...grumblle....

Personally, I ride the Selle SMP Lady Strike. I love the cutout and I love its nose (very supportive in the drops), but I don't quite fit right on it so occassionally my left leg goes numb. This vegetarian broke down and bought a Brooks B68 and then shipped it to Selle Anatomica for a cutout. The mutilated B68 is looking promising, but I've been so spoiled with the SMP cutout that I'm not quite convinced. However, the Brooks does do a good job at supporting the rear end.