Hello,
If I am correct and understand the task at hand: you want a beat and idea for an for an R&B/Hip-Hop track.
I believe this is a task I would be able to undertake fairly well, I have not written all that much R&B in the past, however, I am (like yourself) interested in doing other genres of music. I plan to create the rhythms and beats in Logic Pro and would regularly feedback these beats to you. From here you can tell me what you like and don't like and I can work accordingly to bring you the beats that best fit your vision for this piece of music.
I have only recently signed up to this website as probably representative of my profile, however, I am no stranger to writing music for projects by any means, I recently finished university with a first class honours Bachelor or Arts in music and wrote briefly for numerous media projects before.
I look forward to hearing from you and I hope I get to work with you on this project.