Either a circle member writes a proposal, or is it generated by the circle in a co-creative way, using a process like the one used in this curriculum (of picture forming and proposal shaping).
I am finding that even though we are awkward at using Sociocracy in our circle, the language, “I propose…” helps others to see they do have an opportunity to comment fully, and then accept or object. Our circle is linguists at heart, but this language reminds us of our responsibilities to each other.
In our circle, it is still as unruly as a Senate gathering. But if someone proposes something, we try to assess and pass or reject before dropping the subject. “just being honest… not perfect!”
I agree the explicit-ness of proposing/consenting vs. objecting is useful, yes!
It might help to make an agreement that official proposals have to be stated by the facilitator (everyone can make suggestions but facilitators make proposals)- otherwise everyone just throws out proposal and counterproposals and it can still be chaotic.
But given the scenario you describe, my suggestion might be too formal to land well