US Immigration from Colombia

My wife has been approved for an immigrant visa. We live in Colombia. We are having 2nd thoughts about migrating to the US. Would itbe easy or hard to convert the CR1 to a tourist visa. She owns an apt here in Colombia free and clear in her name.

She hasn't had the interview yet in Bogota nor an apppintment yett.

Any thoughts?

Very happy and grateful to God that after 18 months 11 days my husband's waivers were approved. Someone who has done paperwork with the embassy of Bogot Colombia? how long did it take to receive instructions?

My friend is from Cuba and is about to become a US permanent Resident! His fianc lives in Cuba and they have two children! Can he submit a fianc visa?

Sorry if this has been asked before, but if I submitted two I-130s for my two stepchildren do I need to fill out a separate I-864 for each one, or one is sufficient for both? I ask this because USCIS only asked me to pay the fee for one single I-864 for the both of them, but it is not very clear in the instructions if I need to file two separate ones or just include the second stepchild as a family member following to join within 6 months.

Thanks in advance if anyone knows the answer to this.

My spouse's I-485 Fingerprint collection was too blurry for the FBI, and just got a letter for a second attempt at biometrics will that delay Advanced Parole document? I understand it's processed separately from the I485.

We don't care too much if the greencard gets delayed, or if the work permit gets delayed, we care mostly about the travel document so she can go visit family overseas.

thanks so much in advance,