The consulate won't answer hypothetical questions or advise you, however, they will evaluate your documents you will submit to support your need to urgently relocate, and then make a decision.
It is my understanding from the information you provided that you still have to live abroad with your adopted children for a while to meet the custody requirements? Work back from that date and find work in the US/other unspecified urgent relocation reason your family has to relocate, then submit your request to Montreal. Fill the form with all the information you already have. Keep a running list of addresses, dates of birth, names, etc., in a text document. You will be able to copy and paste the details if the forms get updated until then.
Everyone wants the process to go faster. Right now it looks like you are trying to cut the line by fishing for possible shortcuts [again, this is my perception - it does not mean that you do not have very valid reasons to want to relocate ASAP that would get your DCF request approved, just that you will need to be more articulate on the WHY it is essential for you to move back].
Maybe a lawyer could help you present your request clearly? I understand your desire for privacy, but people here are only able to help with the information you provide. I have seen users help others work on letters/list of supporting documents before, but you would have to provide more details (even if they are not 100% accurate) so that the logic of your request is understood by others.
To answer your last question, filing directly with the consulate does not mean an automatic approval at the interview. They might refuse the visas until more documents are provided, further security checks are done, or even deny them for serious reasons (fraud, misrepresentation, etc.). Montreal is incredibly slow [8+ weeks is the norm] to issue visas if anything has to be provided after the interview, so you will want to make sure you have the correct version of each and every document and form you need. Don't create your own delays.