I suggested simply 2 picks after Adelaide's first, so 14 and 15.
That provides additional compensation, high enough for the Crows to get real benefit, but not too high as to upset other clubs (e.g. giving them Pick 1 or 2).
My personal belief is that something like this is/has been discussed behind closed doors.
I reckon the rest of the clubs would be up in arms about the Crows getting 2 compensation picks, especially after Hawthorn only got 1 for Franklin. Bear in mind that every compensation pick handed out pushes everybody else's picks down another spot. So even 14 and 15 for the Crows would probably be 16 and 17 by the time Brisbane and Carlton get their compensation picks, and everybody else's picks after that are correspondingly lower.
And that's the big flaw in the free agency compensation system. Players' value should be in absolute terms, i.e. "this player is worth pick 1 or pick 5 or 10 or 20" or whatever, not "this guy is worth a pick after your first round pick". That produces farcical results like Hawthorn getting 19 for Franklin while Melbourne get 3 for Frawley. Or the potential this year for the Crows to get 16 (after other compensation picks are handed out) for Dangerfield while Carlton get 2 for Kruezer.
The end result being it ends up being very much in the Crows' best interests to match the FA offer and extract fair compensation from Geelong since they're sure as hell not going to get it from the AFL.