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Yes, theyd be susceptible to grappling techniques as well, but this is presuming You threw a punch, They grabbed it, then swung Their other arm in. Your first priority would have to be not getting hit, followed by trying to close right in and grab on to something. To be fair though, they could let go with Their right hand, and get You around the neck. Its hard to say, since speed, force, skill, experience, and luck will always be a little bit unpredictable. If They grabbed Your right with Their left, then immediately threw a left leg kick, lets say a stamping like kick to the body or knee depending on the distance, how do you grapple that?
For ankle kicks, Id argue that kicks to the leg in general are hard to avoid. Especially since a leg check is basically acknowledging that, accepting it, and just giving it something a big less damaging to crash into. And if You distract Them with punches or somesuch, They cant block what They cant see coming. That being said, personally i find it easier to put more power into a leg kick around the knee or thigh, and that going as low as the ankle, for Me personally, sacrifices some force.