Like Steven said, you don't magically synthesize muscle into fat or vice versa.
Consider some sort of a blend though of conditioning and lifting, maybe sub maximal, but still heavy enough to encourage maintenance of what you've worked for.
Unless you need to lose muscle for any reason (endurance tests could be a factor depending on how much you're carrying).
And if you don't think kettleball squat cleans are difficult, I say, step up to the med-ball
- CJ Kim