Same issue here with a Gen 2 Valentine One. Tried swapping everything including my other Gen 2s and still will not start up all the time. Sometimes it does and sometimes it doesn't. Lots of discussion on the internet but no solutions. I have reached out to Valentine One also. Please post what they tell you.
Based upon what I have read about the refresh electrical system I was a little concerned to go that route. Time will tell and I am sure you will end up having no problems. That definitely would be much easier.
There was some speculation regarding the monitoring of the electrical circuits since the refreshes have some sort of electronic fuse system instead of a normal fuse box and thus is supposedly more sensitive to changes in electrical demand on a circuit. At least one poster tapped a wire in the mirror area and his car kept on throwing errors that went away when the tap was removed. However, several others at this point have tapped with no ill effect. It would certainly be easier to do that than to run a wire through the interior. From owning another Tesla for several years and personally experiencing the downfall of the service experience, I would rather be safer than sorry and on the off chance I do have some weird gremlin pop up in my car, I don't want Tesla to try to blame any sort of wiring modification I have done. I know that is far fetched but it is worth it for the piece of mind to be able to unplug the RD should I have any problems in the future.
I am sure you won't have any problems. Let us know how it goes.