looking to move pick 12.2 and 13.10 for a 6th-7th pick
My advice would be to review past drafts to help you better understand the value of draft picks.
A 12th and 13th could probably land you an 11th, but a 6th or 7th is out of the question.
would a 13th pick and a 8th pick get me a 6th pick?
It doesn't hurt to ask, I guess, but I don't think it would.
For perspective, in the past we've had people sell off their 13th rounders for TPs. Now, that was with a 30 team draft, so the draft is deeper now, but I still don't think that many GMs value 13th rounders very much.