OK.. ..So another option....
You can use a dmss jr rg812bpx 8 even with an rg812bpx odd to get channel extensions up to 16 channels.
http://www.jramericas.com/236276/JRPR03461EVEN/?pcat=474
I have a JR 11x dsmx/dsm2 transmitter. I guess I'm fortunate to have bought it when I did.