On the Mamiya RB-67, the film wind and shutter cocking are separate actions. Not everyone's a big fan of hand-holding these tanks, but they'll do what you want. Just a thought. (The Pro-S and Pro-SD have double-exposure prevention interlocks that can be over-ridden easily. The original RB-67 will apparently allow you to make as many mistaken double exposures as you'd like.)

Be well.
Dave