Like for like or for better, if I'm asked politely I have no problem with it generally and have swapped in the past. As noted myriad times on here though, it's how you ask that matters - don't assume, don't demand, don't get stroppy...politeness and a humble request goes a long way.

However, I wouldn't be swapping 1AK for something else personally without an exceptional reason. I like my 1AK!

What does the seatmap look like for your flight? It's a risky strategy - too risky IMHO. If 1A was empty and you were in 1K as a Gold then you may want to wait as long 3 days before and chance moving your g/f in to 1A. But if it's already taken that means you're banking on a Gold/Prem moving for you. I wouldn't bank on that. I would look for other seats together at 4EF/5EF or 5AE/5FK at worst.

If it's a genuinely chokka flight you may not have much choice - but I wouldn't risk playing the game if you have a choice right now...unless you're willing to end up separated for the flight in the end.