Normally you look to the Reciprocity Tables from the Travel.state.gov website for what documents are available.

I agree with your attorney that it is a reasonable option to do the F1. If you have chosen to travel outside of the U.S. obviously there are...

If the visa is multiple entry, not expired, and you are returning to continue your approved L1 activities, it should not be a problem.

It seems to me that he will not be able to be in line with you when you arrive to be processed as a CR1.

There should be no problem returning at all, I have seen many people do it. The only issue is that you actually return to your real job with your...

Round trip tickets, hotel reservations, and a clear itinerary for where they will be staying and when they will be departing. Proof of property...

Yes, a first EAD based on the 485 will likely come must faster than a renewal. Renewals are taking two years or so.

It would be best for you to maintain valid nonimmigrant status since you never know what will happen with your I-485.

For any arrest you should expect a long wait for a decision, you can send an inquiry after four months, but expect it to take up to a year.

I have not heard of anyone not admitted on advance parole in the current administration. It seems to me that the risk is low.