I had this same exact need for my group and i found a way...

#1 Install Grid + GridCustomLayouts
#2 Insert custom layout:
Code:
Oney;NOR
Twoik;NOR
Twrey;NOR
Fourak;NOR
(You can list all your toons, only those that are online will be displayed)

#3 You may need to toggle 'Horizontal groups'
#4 Profit ?


Grid doesn't always update correctly leaving out toons, but you can easily correct this by changing grid profile. I have a button that toggles between 2 grid profiles. I haven't found any better way to do this, but at least it's working.