Regarding the re-use of E-Visa, I had posted this earlier in my
trip report
I had taken the PDF of the E-Visa I got, edited the visa number (at the top) and the dates to match this trip and printed out a copy. I had guessed, apparently correctly, that while the agent would check that I had a Visa (she did seem to write down something), that she would have no way to actually validate it.
Worked with no problem.