I would not recommend that you use the LLC EIN on form 6781; which would require an override.
This would most likely cause confusion at the IRS with it being attached to your 1040.
As was noted, a single-member LLC is considered a disregarded entity and all activity is reported on your individual tax return. Use your SS# and name on the form 6781.
I would not worry about the 1099-B being reported with the LLC EIN. Should you ever get a notice, this can easily be explained in a reply to the IRS.
*A reminder that posts in a forum such as this do not constitute tax advice.
Also keep in mind the date of replies, as tax law changes.
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