No, morphine is an Opioid and activates the Opioid receptors as well. Reducing you overall MMEs per day and staying at that amount overall a longer period of time will give the Opioid receptors a break but will not completely wash them clean and help prepare the body for pain management after a major surgery.
For example, if you are using morphine sr 30mg twice a day and you have surgery, you will need OxyContin 40mg twice a day for real relief afterwards and for acute pain relief, nothing will work but Demerol, straight oxycodone ir 5-10mg, or intense pain—dilaudid.

Only a vacation prior to surgery will allow someone to use the doses that are actually taking prior to surgery.