Most esoteric situations are dealt with through court cases. This is where a specialized accountant like Green is worth his weight in gold.
Tax law is increasingly complex, with new rules regularly introduced by bureaucrats out of nowhere. When I have researched some arcane corners of it for my own purposes, I then went down to the local IRS office to confirm my findings. Unfortunately, in some cases I knew more than they did, they did not have enough specialized knowledge on that particular topic! One of my sisters is a CPA and an MBA, and yet she would not have the specialized info you need, without some research.
I have been in futures now for 14 years. For just a regular taxpayer like me, the Form 6781 is incredibly easy, as is the Schedule D, IF all you trade is futures. Together they take only a few minutes. Just one reason I no longer trade stocks, options, and ETF, except in my Roth, where taxes are basically irrelevant, thankfully. But in your case, with sole-prop earnings (475 election) I could not give you a definitive answer.
I suggest either an urgent consult with a true expert in these matters, or filing an extension until you absolutely KNOW the necessary tax law details. Taking the risk is just not worth it. The firm that comes to mind immediately has a nice reputation for extensive detailed knowledge of tax law for traders, including futures:
https://greentradertax.com