I am shocked that a team hasn't approached this idea before but then again it could be due to more teams trying to stay under the cap ceiling than over the cap floor.
Why not sign a 35 or older player (in this case Forsberg) to a contract full of incentives (just not based on games played in Peter's case)? Think about this for a sec in regards to Forsberg and the Avs. The Avs could sign him to a 1 year contract at a base of 1 million and incentives of around 4 million (or more). The cap hit would be 5 million+ (hit the cap floor) and Peter could practice and work out with the team (extra "coach" for 1 million) and play if and when able (think of what he could teach the younger players). OR he could sign a 1 year 5+ million contract and until he is able to play, he is on IR... except the 5 mill still counts towards the cap. What's the worst that could happen... Forsberg retires and the Avs have a 5 million cap hit? This would also put a hurt on any RFA thinking that the Avs are forced to spend to meet the floor hence a big pay day for them.