Now I know this is a long shot but bear with me
I know signing him to a deal that is fair to the team would be difficult at best as it sounds like he is looking for about 16 mil per year. That would mean restructures for JA and K Will to say the least, which also would help in the short term as well. A back loaded contract with a lot guaranteed money up front would help, in the range of a 6 year 100 million dollar contract with about $40 million guaranteed may work out well for MN. The contract would be something like $12 mil for year 1, $14 for year 2 $14 for year 3 and $20 million per year after year 3. With that type of contract the Vikings could walk away after year 3 scott free of any sort obligation to Revis (as he made his $40 million already) The average of this type of deal is just over $16 million per year. More on how we fit this into the cap later in this post. Because of his ACL injury the Vikings could also wait to sign an extension as well, making sure he is back up to 100% before committing long-term deal with him. That would mean having him for potentially 4 seasons instead of 3.
Now the question is how would we be able to acquire Revis? MN has several players that fit into the "need" category for the Jets, notably a pass rushing DE and a RB. MN should trade B Rob and Gerhart, along with a mid round pick for Revis (im thinking 4th round, 3rd would be the highest I would offer). I would call that a "fair market value" trade for the Jets, as Woody Johnson stated he wanted for Revis.
How do we fit this in to the CAP?? With trading Robison and Gerhart, This saves just over $4 Million in cap space(B Rob $3.1 million, Gerhart $971K). Restructures for JA and K Will would save MN 6 million a year (K Will would take a $2 Million pay cut short term, and JA would take a $ 4 Million cut) OR MN could just cut K Will loose and save the whole $8 Million. If they choose the latter and cut ties with K Will (which may not be a bad idea, he is still a solid interior lineman but he is not the force he once was) then a DE would be top priority in the draft to replace him (see somebody else's mock for that, I have done enough research tonight)
Finally, how Does Revis fit in the game plan? He would have to replace Winfield as the starter. Don't get your panties in a bunch about this just yet though. Winfield has been a fan favorite for a long time here in MN and he needs to be on the field as much as possible. That said, Leslie Fraiser likes to play a lot of nickel defense. Part of the reason is because the Vikings play 3 Good QB's within the North Diviision. Winfield was used predominantly in nickel situations in 2012, so expect more of that in 2013 to keep his legs fresh for 16 games.
This is very dependent on plenty pf pieces stacking up just right to pull this off, but it can be done. Right now there is 31 head coaches in the NFL salivating about the prospect of having Revis Island on their side every Sunday.