Yes, you’re ignoring subconscious processes, but their existence directly contradicts the assertion that, “It seems fairly reasonable to suppose that any organism with sensory inputs that can act independently (perceive its environment and interact with it) would have to have some kind of consciousness to operate through”

that can easily be explained as happening through a mechanical and/or chemical reaction locally. I wouldn’t call that kind of stimulus a “sensory input”. If it was, then what would the sense organ or means of receiving or transmitting the sensory input be, and what would it be that receives or processes the input? There’s no nervous system or comparable structure.

The sense organs are the plants’ exterior/bark, just like we have skin. And what is the nervous system if not mechanical and/or chemical reactions? Sure, we fire calcium ions along chains of nerves, and plants fire calcium ions along chains mechanoreceptors. Again, i challenge you to think outside your human experience – the way you think, the way i think, those are just tiny examples in the potential universe of the ways any living being could sense, calculate and act.