Interesting dilemma Ian.
Reflecting yesterday's discussion on the SC call, it should not come as any surprise that I would be tempted to 'wing it' on the 'open for business' option.
I think you can only do that if you are 100% certain that you have:
1) the 501(c)6 done and you can wave the Certificate of Incorporation around with ID Pro's EIN on it, and
2) a bank account opened in ID Pro's name.
If you can be as certain as you can be, that you can evidence those two things in the remaining time, you may be able to 'wing' the rest (even tho' between us here, we know it will take more time to get ID Pro operationally 'open for business').
If you can't do those 2 things in the closing timeframe, then IMHO, you may be misleading folks, and it would be better to give an update (your Option 1).
FWIW..
Cheers
Colin