I don't know if this is helpful or not, but maybe looking into footage of Shidokan tournaments will provide examples of the sidekick used in conjunction with MMA grappling. The fight format is 2 rounds of bare-knuckle full contact karate, 2 rounds of Muay Thai, and 2 rounds of MMA. Those last two rounds would be the critical ones to watch the interplay of sidekicks and grappling, if any.