Other viable subsume include Spectrorage with [Spectrosiphon], Lycath's [Hunt], Nourish etc.

For [Spectrosiphon] subsume, swap Equilibrium out (or Rolling Guard). If you choose to swap Rolling Guard, you need 1 less forma (can just forma the -- slot on [Equilibrium])

For shared polarities, this build has 2 = polarities. If you would like to ignore Archon Stretch, you can actually just get away with 2-3 forma.