There is no hard rule on this, but they tend to say no on the freighter due to a reduction of available seats, now only 4... You will not get a nominated freighter base.
Business travel to/from home. First does happen, but rarely.
11 days off, 3 travel days (max)
No alcohol, you are on the GD.
You can change your travel port, no problem.
Also, don't go!