Did any delegates write up a complete first draft proposal for discussion? No. At least not lately.
That's sort of my point. He's criticizing people for not coming up with drafts, and that's why he says he doesn't bring them up, but he's more than happy to write all the proposals he likes.
I think he can introduce his own proposals as if he was a delegate. I scanned through the rules of order, and I don't believe there is anything that said he can't do that (correct me if I'm wrong). If you or another delegate drafted a preliminary proposal, I'm sure Purple State would open debate on said draft.
My point is, the delegates have responsibilities beyond voting, including the drafting of a proposal or an amendment should they want to. If you could draft the amendments to the constitution you wish to see in the correct format, things may be different.
