What MK should do is this...
We all know his story about the strong urge for his first electric guitar. I bet there are thousands of kids today that feel that same urge for their first electric guitar, but many of them may not have wealthy parents. If he teamed up with Epiphone or Squire to create an affordable first MK type of guitar (yes I would think that pretty much zero kids know of MK today unless they have quite the wise parents).
That story and product would be sold for 330 GBP in a heartbeat. Plus he is able to secure his legacy (= more GBPs to the estate) for another one or two generations to come. Also, throw in a small percentage of the proceeds to the Star Foundation (or what's it called).
That's how you sell and market in 2020.