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Honestly man buy the risers with the desired extension you want.
Adding an 4in extension to those risers really wouldn't be truely safe if you think about it. I've seen 1 to 2in, I even have a set of 1in to ad to mine to give me a full 21in bars, but not sure if the cables would be compromised.
What size bars do you have?
I wouldnt even consider 4 riser extensions. Half your riser length is an extension - basically a grade 8 (hopefully) bolt? Not me. Mechanically, theres probably nothing terribly unsafe with it, but it just doesnt seem right. Easier and safer to just get a set of 8 risers - something like these:
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