I would probably go with AudioNote instead of these cheap kits, but - why not?
It’s up to you.
I have replaced internal wires only when original was broken.
Been using Cardas, Discovery, Van Den Hul silver, never used Audio Note silver (that one is the most expensive).
I use many vintage tonearms and I have no intention to rewire them, the sound is nice as it is.
As for the external wire I can’t hear a benefit of silver over copper, so I am skeptical about it (snake oil).
Once I bought EPA-100 tonearm I asked the seller to rewire with his "expert" and there was a problem with ground after I received my rewired tonearm. Sometimes it’s better not touch/replace anything if it works fine.
But I agree than manufacturer can do the job properly, but their price is usually higher.