If you are dead set on 4DTV less the bud, you might see if there is a chance in heck of getting DC lock on G1-3 with a 1.2M dish fixed on G1. I think it may be doable, but for sure it isn't a reccomended setup.
With my 5' Prime focus I'm able to lock G1-3, get the guide, and sometimes watch some of the pay channels I've subbed to on G1. Luckily G5 carries many on the Starz / encore channels too and I don't have any problem seeing those

.
Basicly - to get the guide and I believe the authorizations to see the programming you want to sub to, you need to be able to lock G1-3 (C-Band).
Beyond that you could likely use the 4DTV slaved to the Pansat for the X4 channels but it would kind of suck becuase the polarities would be all over the place. If the 4DTV will control a voltage switched LNB you could use a dual LNBF on the Ku dish and be all set there.
I'm not even sure that the 4DTV will work with a voltage switched LNBF though. Maye the 2 Ku and 2 C band LNB setting would work since that almost implies some kind of multiswitch.
One last note... If you ever did go this route, you'd be kicking yourself in the butt for not going c/Ku and getting it all.