Lannis, I understand your position on this. The labor to pull the parts and look at the tappets would be about $400 (it was in my case). If the tappets are bad you have the dealer put in a claim for the kit. If not you put everything back and hope for the best. In 10K miles do it all again. Given that this is not turning out to be a case of owner misuse, odd climate, or bad oil it seems that the question is not 'if' but 'when'. You feel lucky?
I like the bike so eating $1K was a tough meal to swallow but I can't think of a bike I like better. I'm still hoping that Piaggio will pay for the kit. When I had a Multistrada we had lots of problems with the gas tanks swelling. In the end there was a class action suite that cost Ducati, or the tank supplier, a bunch. The lawyers got rich and the owners got a new tank. I hope Piaggio got the message. It would appear that this problem extends to all 8V engines sold in the US. It's expensive to comp a $1K assembly to every 8V owner but when you get some lawyers involved the bottom line will be much worse.
To answer your question, yes, I decided to do the replacement no matter what. Now I see that my tappets were in the early stages of going to shit.