Alex, for the missing feet there, try using Sugru, https://sugru.com/ It's a mouldable clay that sets into hard rubber in 24 hrs. A lot of people are having success with it.
I'm going to use it for the frayed ends of my power adaptor (another common problem with macbooks). Have a look here, their packaging even shows the fix on Apple power adaptors as an example of what you can do with it:

A bit off topic, but I also have a very rough edge from wearing a watch and it tapping constantly against the right front edge (which is normal when typing on the keyboard), but i hadn't noticed it for a while. I feel the roughness all the time now and have removed my watch when using my macbook. This is also a common problem and people are advised to remove metal bangles and watches when using a macbook.

Apple make such beautiful and wonderful products, but it's like Apple don't test their products in the real world. Makes me wonder, a lot, if the Apple employees (including Jony Ive and Tim Cook) suffer from these same problems. They MUST also have these issues.
Do they wash their hands before using it, and wipe the keyboard clean before closing it (to prevent grease interacting with the AR coating)?
Do they have power adaptors at home and in the office toso as not to move the cord (to prevent the cord fraying)?
And do they remove their Apple Watches (with metal bands) to prevent it damaging the edge of the wrist rest?
But none of this is normal 'expected' behaviour.
There should be FRAGILE stickers on the device.
Macbooks are wonderfully designed and engineered, but it's like they have to be used in a sealed glass box, not in normal everday use.
Back to the topic, I'm going to the Apple store when I go back to London, I'm still in the EU 2 year warranty, and I'll show them this thread. I'm usually quite good at reasoning, and this AR coating deteriotation under reasonable use should be covered by the EU warranty (a defect that was there from the time of purchase - which is badly applied AR coating that deteriorates to a point of making it unsuitable for its' intended use (i use it for graphics design).
I'll report back the results.