Bad news - since that set is not in any way obtainable anyway, it seems that window is already closed shut, and i'm sorry for that.
Good news - as i see Gensym set can still appear at Xur's, and it's Io set, and Io's being sunset for quite a while now, i see a sliver of hope that Scatterhorn might be reintroduced into either Xur's or Ada's loot pool some time in the future. So, keeping the hopes up doesn't seem to be in vain at all.
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I'm stuck only needing 1 piece of gear for warlock to finish off that collection badge entirely. One could only hope that it's sold in the future!