I see you have edited this post which I had already replied to, which is why I do not recall reading the be a man bit beforehand.
Over here we call that sly or under handed, ie untrustworthy.
I have not been in their for years, went in the once and asked for price on front brake pads for wifes A6, 96 quid he said, I was still laughing when I walked out the door.
Eurocarparts are expensive now, for just about anything. I rarely buy anything from there anymore, occasionally they have a good offer that makes them competitive but not very often.
Best thing about the 200 swap is no chassis changes are needed, so dead easy to swap back if you so desire.
As for the dvsa less you tell them the better, so long as insurance co know it has had an engine swap no worries in my eyes.
You are aware that BOTH the front and rear parts of the drivetrain are always engaged as its permanent 4wd aren't you? Your wording seems to me to indicate that you think that it's selectable 4/2wd and that only the rear is driven all the time?
Bit of a pita, but jack up and remove each wheel in turn and see how much free play the brake pads have.
Seen it first hand where the caliper pistons do not fully return as the wiper seals are dry and when you release the pedal the piston moves...
Dry fill and wet fill, find out the differenceand that is how much old oil is left in the engine after you have drained it.
Literally just jinished oil change on an mx13, ran for five minutes and oil is black.
That is my view on oil When it comes to a 200tdi! Although I knew the risks of starting a debate. All I really wanted was the best place to buy at a reasonably price 🙄