All you have to do is squeeze a third note out of one of the doubles to create the grace note for the flam. The difficulty is that now, that hand only has the one stroke by the opposing hand to prepare for the next set of doubles. At speed that can be problematic. At moderate tempos, it's pretty easy. Here's a good example of what I am talking about
(Grace notes in lower case)
Played as triplets:
lRRLLRR rLLRRLL lRRLLRR rLLRRLL
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