You can. But I think it would be easier if you didn't go through SP first. By the time you end up in sleep paralyzis. And correct me if I'm wrong here, I've never had SP, so it's not something I know a lot about.... But... by that time you could have already started a dream if you had let yourself fall asleep instead of forcing too much awareness, and it would be a normal WILD. The aim of WILD is to fall asleep...

Another thing to keep in mind is that if you are doing this when going to bed in the evening, there is a good chance that you're not ready to have a dream yet. REM sleep comes later.

But all in all, it sounds like you could have lucid dreams if you do WBTB and then do what you have been doing.