I’d say that’s an unnecessary step, if you’re going to sand it down anyways just get a blank. Cheaper and you can buy it from a really reputable shop and guarantee it is what they say it is.
If you’re going to go with hub motors I’d say Carvon’s are the best bet. Might be hard to find a set of 2.5s around though, and waiting for V3 may be a while and that’s if he ever sells them separately. I am not sure on his plan there. The urethane on his build is more sufficient than others and it’s a dream to ride on them. I have dual hub motors and everything Namasaki is saying is true to my experience, but I haven’t had any issues after a year of riding it. Buy a reputable set, install them properly with the right VESC values (go safe on the min/maxes and Voltage) and you should be find to ride for awhile without any concerns. If you do go the hub motor route keep in mind that they tend to perform better and seem to be made for high RPM. Whenever I run them at low speed for a consistent period they get much hotter than if I am going near full throttle for that same distance.
To answer the VESC question they can be different, but I would just get them from the same place if possible.