The only update I have isn't a great one. After posting my frustrations here, I emailed the Kansas City folks and got back a very friendly response that truly seems like they're trying to help. He indicated that leaving any steps open can slow down VIN assignment (had never been told this before, but am also considering trading in my Model 3, so didn't want to close that step). He went ahead and completed the remaining steps and said we could reopen them once I had a VIN. He then indicated he had reached out to the "demand planning escalation team" to hopefully secure a more accurate delivery window and would get back to me toward the end of last week.
I haven't yet heard back regarding that, but in the meantime, my EDD in my account did slip again. I'm now showing August 7 - September 18.
For those not wanting to find my previous post, RN11441 ordered in January 2021. MSLR, MSM/Black, 19", No FSD.