Hal 9000 said:

Then it wouldn't be in sync with the GOUT.

If by GOUT you mean the audio, I have found that its fairly easy to remove the 'yes' part of the original 'yes, I bet you have', which is where the missing frames are, so it all flows nicely. With a simple 1 ms audio fade-in and fade out around the audio cut, i've found the audio to flow pretty much seemlessly to me, with Han now saying 'I bet you have' then bang, fried Greedo. I'm no audio expert but i've found that this works for me and the audio cut is not really noticable. It certainly helps that there's no musical score in this section, would have made the audio cut more tricky otherwise.

I know Harmy is trying to recreate these films exactly as they were theatrically but I have to agree with Darth Tater (cool name/avatar btw) on this, they are all pretty noticable, though like others here have said, method 1 is definately the most obvious and jarring. I think it might be worth compromising here and cutting those missing frames and that part of the audio where the missing frames are to not disrupt the flow of what is a very cool/iconic scene for Han Solo. Another option of course would be to take the whole final shot of Han before he shoots Greedo from the GOUT rather than just the few missing frames, that would certainly be less jarring than changing between two sources of differing quality in the same shot.