It seems nobody has any interest in this stand, but have you really taken a look at the possibilities?
The current price is about $60 on Amazon.
http://www.amazon.com/dp/B006JG7G2EManufacture product page is
http://monmount.com/multi-monitor-stands/triple-stands/lcd-1930/For the money, I don't see why it couldn't be worth moding the mount to make the arms a little longer, to accommodate at last 24" monitors. I know my monitors would be way under the speced weight limit. It might be worth it, as the articulated design is just about perfect for our use and can... if the arms were a little longer.
One easy suggestion that might work is simply attach a metal plate to the end vesa mounts, that would allow offset mounting of the monitors further out, and then bolt the monitors to the other end of the metal plate. I suppose a block of wood could also be use for this purpose. I believe they even make offset adapters for VESA mounts, but they cost like $30 each for a bit of metal plate with a few holes in it!
The price and design of this mount seem worth the time to experiment, and find a solution to getting a couple few extra inches of width needed to be perfect!