Viper strike of mamba in phrecia

Dad gamer and too busy to learn to create my own builds (and most likely also to stupid) here. I enjoy laying starter builds. So far I haven’t played vsom in the keepers league and wanted to see if it is viable in Phrecia. On Poe.ninja I saw only ~200 chars with it in the last event. And haven’t seen it mentioned in this sub.

Is it not really enjoyable to play without the pathfinder ascendancy?

If it viable does anybody has a progress guide?