Yes, you definitely can combine those two techniques. WBTB is often combined with any type of WILD and even MILD and actually makes WILDs easier since you are going directly into a REM cycle when you fall asleep. You can combine many different techniques, for example I preform DILD by reality checking and questioning reality throughout the day, ADA at various times throughout the day, then MILD while I'm first falling asleep, then a WBTB several hours into my sleep followed by another MILD while going back to sleep, and I also DEILD when I get the chance but I don't set any alarms for it or anything. Basically I preform every major technique except a straight WILD.

Yes, people do this every night and yes, you should try it since it will increase your chances of being successful with a WILD.