Yes, you can use GTG to improve your 4CBD.
I don't really see how chinups would help very much, as the 4CBD is a ground-based exercise. If by "vibration" you mean using a vibrating platform, yes I think it could help (but isn't necessary).
I have ideas that may help, but there is no point in providing a solution to the wrong problem.
What do I mean? Well, something to think about is the nature of the exercise and the attributes you are using it to develop. You said you can only hold each position for 5-10 seconds. This makes me wonder 2 things:
1. WHY can you only hold it that long? What causes failure after that point? Loss of Balance? Pain? Fatigue? Something else? In order to help you get better, we need to understand what's standing in your way.
2. How long do you want to be able to hold each position?
Regarding question number 1, you might want to think about whether this is a hardware or software issue. I made a video recently that talks about this. Check it out if you're interested:
http://www.youtube.com/watch?v=_TuYZaztBQU
Not sure why you think he would tell you to get a program that hasn't been available for purchase from RMAX in 5 years...