I think it takes a combination of relatively slow weight-loss, somewhat of a lifestyle change, and a difficult maintenance period during which leptin and metabolism raise to a steady point.
If you incorporate all of these, then MAYBE you can maintain it. It depends on your setpoint. I think it is possible to change your set point a bit by making sure you maintain the lost weight perfectly for a long while, but if you try to go to 5%, your body might never accept this and constantly fight it no matter what you do. This depends on the individual.
You probably need to change your lifestyle. You MUST eat a lower number of calories at your new bodyweight (unless you bulk first and add muscle). You also must maintain a consistent exercise schedule.
You need to lose the weight slowly so that it is even possible for your leptin and metabolism to become steady and manageable after a maintenance period.
I think that ECA is good for maintaining lost weight, as it has a long-term effect of sustaining and even raising T4 to T3 conversion even with a caloric deficit. Other burners can be used to get past plateus. I only have experience with ECA and yohimbe. You could use ECA near the end of your diet and during the maintenance period. Then you would slowly taper off of it after slowly increasing your calories. I don't think refeeds are a good idea when trying to steady your metabolism.
Lastly, can you handle the stress of maintaining this? It might be hard. Take breaks during your diet to maintain. This will make the weight-loss more permanent, save some muscle, and make it a more enjoyable experience.
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