I wasn't able to get any Soyella. The day I went to American Sember, things were packed away and the ones I wanted could not be found. BTW gdl203's new store carries a Soyella shirt made by G. Inglese. It happens to be on sale.
I think that you are right that Foo might quite like the Triplo. It is smooth with lots of body and I suspect the 3x3 yarn will last relatively long for what it is. The downside is that I think it wears a little warm. I don't mind given that I wear mostly linen and cotton/linen blends in the summer.