First off, I'm going to make it clear that just because there are escapes from this position, does not mean that you would EVER want to end up here. Escaping, especially in realistic conditions requires both patience and the ability to act fast and decisively. So, I'll walk through some scenarios:
It doesn't matter how you ended up there, but you find yourself victim to a standing backtake. Now you need to escape.
If they have your back, but have not yet applied any kind of choke yet
Your priority here is to protect your neck at all costs. You are lucky that they have not yet wrapped their arms around your neck, so use the opportunity to prevent them from doing so.
If they have your back AND have started to apply the choke
You are in immediate danger of being submitted. If it's a real fight, we're talking about your life. Pry away their arm(s) from your neck and start to protect it by wedging a hand or forearm between their arm and your neck. Once you have isolated one of their arms, you can start to work towards a hip/shoulder throw, like the seoi nage.
I'm not really able to picture standing back control that involves hooks with the legs. Since I am currently unable to try it out myself, the best I can do is imagine this. It seems logical to just spiral your legs to the outside to escape their hooks, but they will just put them back in. So, if you find yourself with an opponent who has your back from standing, with two hooks in, simply fall backwards. If they try to post with one of their legs to prevent themselves from falling, they have to remove one of their hooks, freeing your leg. If they do no post, the will fall backwards into a traditional back control (back mount) position. It's not a great position to be in by any means, but it's better than being stuck standing with a choke being applied. From the ground, you can start to run through your back escape sequence.
If it's a real fight, this comes with some bonus, as slamming their back to a hard surface like pavement WILL injure the opponent, giving you the upper hand. However, that falls into the realm of can/should. If your life is in danger, that could be your best option.
Coming from a heavily BJJ background, I believe that you are better off taking a fight to the ground than staying standing. So, using that idea, purposely dropping to the the ground when put in this position is very tactical if you have any sort of grappling training whatsoever. I also do not watch MMA, so it's hard for me to put a lot of this into context. I am going to go out on a limb and say the reason that this is such a rare ending to a fight in MMA is because it is hard to get to and it is most likely not going to be a fighter's objective to take the back from standing. I can only think of two scenarios where this could happen, one being the defender isn't quick enough or fails to put up proper defenses in time, leaving their back exposed, the other is a backtake from a standing headlock escape.
I hope I answered your question, or if not at least helped answer it.