Application instead of immediate registration?

I have a bit of a unique situation: for just some of my courses, I want to be able to screen participants before accepting them into the course. I would like to have them submit photos either as part of the registration or emailed separately before their registration is approved. Payment could be done with application or upon approval - their spot wouldn't be confirmed until photos are reviewed for acceptance and payment completed. 

Is there a way to do this within EB? 

Thanks,
Melissa

We do not have a native way to handle that kind of requirement at the moment.

Regards,

Tuan