Michael Jackson’s estate is reportedly trying to slap a muzzle on the King of Pop’s sex abuse accusers Wade Robsonand James Safechuck — and their savvy lawyer — and put off the pair’s civil case until the release of next year’s big-budget biopic about the late singer, RadarOnline.com has learned. MJJ Productions and MJJ Ventures, which manage the interests of the controversial hitmaker who died in 2009, are accusing the duo’s attorney John C. Carpenter of conducting a “media blitz” chock-full of “incendiary claims,” according to the Globe. Robson, 41, and Safechuck, 46, charge The Gloved One m…