Sil_Dan

Any building will be wheelchair accessible. No need to worry or notify.

you may choose to never set foot in the US and there will be no problem...

For the rest of your life if you want. There are no restrictions. You still have to file taxes yearly though.

http://www.newcitizen.us/after.html

Well honestly, what's the likelihood that someone has been an LPR for 2 years and 9 months but married for less... because you NEED to be married to get LPR through marriage.
Lets say you get married and your immediately apply for AOS. Your AOS is approved in 3 months. This means that when you've been an LPR for 2 years and 9 months you've been and married for 3 years.

It is not legal to work unless you have the EAD card or green card.

Correct. Sort of.
Actually there never was a "loophole" unless you just want to say that. The K-1 is not and never has been work authorized. There was a clause on the I-9 form that a K-1 could fall into and therefore it was not clear that they could not work and the law could not be enforced. In February 2009 the wording on the I-9 form was changed to clarify that the person must have a specifically authorized work visa. The K-1 is not, they now enforce the law against K-1s not working
You MAY get an "employment authorized" stamp at your POE. Several of them just give the stamp to pretty much everyone (they gave one to our 13 year old K-2 son)but it means nothing in the absence of a visa permitting work.
As far as SSN goes, the K-1 is default catergorized by SS as "work authorized" so an SSN can be issued since some states used to require an SSN to get a marriage lisence and this allowed K-1s to meet their marriage obligation. The SS office does not determine who is eleigible to work and neither does the state department. USCIS does that and K-1s cannot work. If your K-1 fiancee gets an SSN it will say "not vaild for work without DHS authorization" and you don't have authorization.
After your fiancee arrives, get married and file the AOS papers with an I-765 for a work authorization and you will get the work authorization in 3-4 months.

You did not get a denial, you got an RFE. You did not go to an interview, you went to a biometrics appointment.
You do not understand the process and have no clue what you are doing so it is no surprise you have not submitted what they need. Stop now and read the guides here and the instructions before answering the RFE because that will be very important. If you are not capable of understanding this, then I suggest you pay someone who does.
Children are not a requirement in any way. That is a suggested type of evidence. Read, study, or get help.

Wow, really??? You're coming on here asking us how to dump your wife off in her country...and to kidnap your child???? Oh...and you want to "pay off" a judge. You sound like great husband and father material.

no, they don't mail you the kit. you can download it now from the website or get the booklet at your biometrics.