Anything is possible. I think it would limit the amount of couples that would match though. I'm sure there are more than a few on this site that have to some extent gone through the same thing. Generally the pace is set my the softer play partner.
By the way we are the opposite..... He is more experienced in this lifestyle and has done full swap with previous partners so is ready willing and able for that. I on the other hand am not ready to go that far.
Communication is the key. When you meet another couple be upfront about what each of you feel comfortable doing.
~N