I am recommending he drill and tap the isreali stock into the aluminum rib right in front of the magazine / as close to COG as he can get. And then put in a threadsert.
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I have both the hog saddle and triclawps....I likethe triclawps better. Thinking of getting the magpul tripod adapter for my slidefire setup.
http://www.triclawps.com/
Thanks for the replies so far everyone. Still researching and figuring out what might be best interim and/or final. Definitely like the ease of the COTS options, but I'm open to DIY still if I feel it can work without too much headache.