I think you're presuming too much. As long as your code is documented and you're willing to release all potential IP claims as part of the sale I can imagine there would be someone interested in buying this straight out. You might even be able to sell them some kind of limited support/consultation agreement where you don't do code but can answer questions for a fixed period of time. It's not like you're doing some kind of business exit strategy. You're just selling off an asset from your portfolio.
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I think you're presuming too much. As long as your code is documented and you're willing to release all potential IP claims as part of the sale I can imagine there would be someone interested in buying this straight out. You might even be able to sell them some kind of limited support/consultation agreement where you don't do code but can answer questions for a fixed period of time. It's not like you're doing some kind of business exit strategy. You're just selling off an asset from your portfolio.