No answer...but admission as to a sticky situation...well I s'pose if the BJJ'ers admit that striking is necessary then so should we admit that takedown defence(of a serious nature) should be examined...likewise!
I don't really have an answer! But here goe's:
answer1) Pull them down into a knee and twist head too extreme's when on ground, (whilst thinking of an eye gouge!)
answer2)Hammer fist after palm strike/grab to head. (When on ground stomp on head and run for the hill's.)
answer3)Bill Gee{I don't have a clue what this is...but being the third form it should work shouldn't it_ ohhhhh I get it Wing Chun is not allowed to use their third form in competition's- is that it?! c'mon...gimme some answer's here...I'm searching for the truthmaate!!
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Use attack as your indestructable spiritual strength.
Awareness is the spirit.
Attack is the foundation of thought.

Attack like thunder from the heaven's.
Retreat like dust of the earth.