I'm going to give my take on what I would do. Maybe others will find it handy also.
First of all this tree is not healthy. It is not thriving for a maple. It needs to come out of the pot so it can gain vigor to do the training that is necessary. When it has reached that point and the training is done and your tree is ready to be shown, then put it into a pot. The pot does not afford the rootage to help gain vigor so get it into a box in spring.
The good points.
Nice taper in the trunk and the base is superb. I feel this is probably a Kiyohime or a Kiyohime hybrid. The branching is not perfect for a broom but is good for a spreading meadow maple image. It just needs to tighten some.
Poor points
Bad knobs due to incorrect pruning and not being cut back enough at the correct time. Internodes way too long and wrong as a foundation for a maple.
The good news, there is no better species for a good deciduous tree than a maple.
The bad news, there is no other species that takes more work to keep good than a maple.
My method takes balls and commitment to the way maples respond and grow. First thing is forget all this wait until it hardens off to prune. Thats bullshit and if you do, it will take decades to turn this into something. In the spring when it shoots out let it go to six leaf pairs and prune it back hard. Hedge it!!!
Let it bud, if its strong ( and it will be cause your going to put it into a box and allow it to grow) it will bud profusely. When it does do the same thing, wait for 6 and hedge. On the third go around, your well into summer now, prune at four leafs. and the last go around, prune at four again. Now don't do any thing else all year. Let it go. This should be about the beginning of August and it will be slow growth now anyway and will not bolt.
The next year will be rewarded with small branches and short internodes. Now you have a foundation to work from and can start picking out that which you wish to keep from all that you have now.
I bought a big Kiyohime in a two gallon container. The trunk was about 1 1/4 " across and about 2 feet tall. A big umbrella of foliage.
After leaf fall this was the skeleton.
I cut it back and had this.
While that was a good look and feel, I did not want to build the rest of the tree on those branches with the long internodes that would never bud and would look stupid. So what I did was the method I am suggesting here. I whacked the crap out of it. sealed everything and knew it would bud because it was strong. I performed the hedging method I described all year to it. This is where it was in the Summer.
This is the tree right now, just starting to turn for Fall on Dec. 5th. Now I have lots of leaves but they are close it and I have something to work with now. I was never going to make anything out of what I bought. I had to go for it. I'll find a front and begin picking branches this Spring. Good luck.