IMO your best option might be to go with a bottom pull road triple (assuming it's compatible with the lever cable pull ratio). Reversing the cable from top pull to bottom pull is easy enough using a clamp-on pulley made for the purpose, or as I do, looping the cable under either chainstay.
If looping the stay you can use a piece of teflon tubing, or as I do, a strip of metallic tape, ir muffler tape. The cable will find the shortest path on it's own and stay there.
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