Hmmm, you're caught in a certification black hole with that combination...
Your options:
1. Sit that WN4 class, pass the VCP4 exam, pass whichever VCAP4 exam you choose.
2. Wait for the VCAP5 exams.
I think realistically there will be about a month between the options above. Option 1 you could have done by say mid-March, and given that DCD5 is in beta over the next couple of weeks in theory it could be available mid-April...
How come you need to be a VCAP ASAP?