Yes you may include foreign assets for this purpose.

Provide a written request to the USCIS service center processing the case.

Yes your answer is correct as indicated.

Yes this is not a problem as long as USCIS civil surgeon.

Yes you should be ok traveling within the US.

No this can be amended at time of interview.

No this shouldn’t impact subsequent visa applications.

No you would not revert to being an LPR.

You should submit a written request to the USCIS service center processing your case.

I would rely on the advice of your retained counsel.