You may interpret my reaction as being "sensitive", it doesn't bother me. My reaction is simply my way of saying there are other people in dire need of the help I'm willing to provide and I'm not going to waste my time on those with faulty or skewed understanding of the process and who insist they're right. I clearly don't know everything sorrounding the DV process myself, but I certainly don't have the time or patience for BS either. Now, that we've cleared the air, we can both move on.
Regarding your situation, I'm not sure if KCC can/or will be willing to unlock your form again since your interview date as already been scheduled. Also there's no point adding your wife as a derivative if the plan is to petition and sponsor her own GC application some other time.
However if the plan is for your wife to also attend the interview and benefit immediately from your selection, then you may need to contact KCC and request for them to unlock the form right away - (you can begin to fill out the add derivative portion like
@usamommy2015 suggested while waiting for the form to be unlocked), email a copy of your marriage certificate to KCC, you may or may not need to contact the embassy to change the interview date depending on when KCC unlocks the form and when you're able to complete the medical exam for your spouse, attend the interview with your spouse with ample prove of the existence of your relationship prior to your DV selection. Following a successful interview, you will most likely be issued with a visa which is valid for 6 months, you travel immediately while your wife stays back and you can then decide if life in the US will be worth it or not and your wife can join you before her visa expires.