I'd suggest tartaric or maleic; and I have a feeling you're going to make a mess and lose product if you use limonene. LSA isn't as forgiving as DMT, with regards to hippy fad teks.
*edit* - you don't necessarily need inert gas for the extraction, but dim lighting is necessary, or you'll see a clear solution turn beige, then amber. Once it's complexed with a dicarboxylate, it is rather stable. store in amber glass in the freezer.