I'm with MDS on this one. 9 cables coming out of 1 box isn't good, that's why they don't make plates like that. I'd put a double gang in and use a 4-port insert in one and a 6-port insert in the other, and just put a blank insert into the extra port.
Either that or it might be easier to add another box in the wall rather than ripping out the one that's in there. Either way, it's the same setup with regards to the plates you use.