I don't see the logic in attempting to re-invent the cylinder head design instead of spending a few extra dollars on the correct oil. The Pumpe Deuse engines were only made by VW for a few years, reportedly because they didn't want to pay Bosch for the common rail tech they ended up with eventually anyway. Despite that, cam systems can last a long time if the correct oil is used. Just to reiterate, the best oil for your car is a 5w40 that holds a VW 505.01 approval. With that oil the cam system can easily last hundreds of thousands of miles.
OP, listen to ^^^! Not only does he know these cars, he is a major parts vendor for these (and a lot of other diesels). My life has been made a lot better because I listened to people like him!
When VW put out the maintenance intervals that was... YEARS ago. Oils, basic oils, have improved a lot. But, in the case of your engine you MUST comply with the spec- no "might be compatible" or "it's high-end oil so it IS good" apply here.
Best would have been if you'd have taken a baseline BEFORE doing anything. When I got my car I sent an oil sample off to the lab in order to get an idea of its engine's health. My engine, though it looked like it was mixed in with retrieved sunken treasure, was in excellent health. I'll note that it had 5k mile intervals changes with high-end (appropriately spec'd) oil. Previous owner shelled out WAY more than necessary; but, I am thankful for it; read: "if you want to do a future buyer a service then shell out more than is necessary!" (but, it's unlikely you're going to be able to recoup that extra expense, especially on our cars which are getting way up their in age). For over 100k miles I've been running a mid-grade oil in my TDI (ALH motor; more forgiving), as well as in the wife's TDIs (she's had two of them now) as well as a ton of other diesels I have, and everything continues to work flawlessly. My car just hit 220k miles, and had managed 800+ mile and 55+mpg tanks in 5 of its last 6 fill-ups.
My truck mechanic (for my 12V Cummins) has a BEW [I believe] TDI. Currently about 180k miles. It's his wife's car. Because he's a high-performance guy (doing compound turbos on all the folks' trucks out here in the hinterlands) he HAD to tweak that car. Raced it for one season. 7 lb flywheel. Waste-gated turbo: he'd gotten up to 53 lbs of boost, but after blowing up 3 turbos he decided to hold back to 35 lbs. The bottom end AND the cam(!) are still stock. A point to be had here is that VW TDIs are extremely tough engines, there's no need to handle them with kid gloves, to use super fancy oils and such.