Yea we both use the FILD method in this technique but theres a few things different from mine,
1.) For me it doesn't really matter if I get up or worry about the fact that I just moved a muscle (now i cant achieve the WILD mindset) I guess it will be different for most people. Some people say you must do a WBTB for 60-90 minutes. . .
2.) The main part is that when you stop the finger movement you will trick your body almost immediately to fall alseep.
3.) As you said "I couldn't get it working as a regular WBTB/WILD." well this has worked 4 out of 4 times for me after a WBTB attempt. But again we are all different. . .