Sounds like we're in similar places. I'm happy with my BKPs, Duncans, Fralins, Lollars, and Gibsons, but would like some new blood so to speak (variety). I know that the last 5% of quality is 95% of the cost (can't remember where I heard that, but it seems to have some truth), so the question is, is that last 5% worth it, to me or to you or to anyone. Like you, if the result is truly exceptional, I'm fine with that. This thread grew out of my "frustration" with having so many choices that largely seemed to all be valid. If a PAF was a single thing with a narrow set of parameters... but it's not, so it makes the playing field that much larger.
As many here have said, there are a number of winders who are definitely achieving the PAF sound. Vineham is well reviewed, but I can understand what you mean about them being inexpensive. I would guess that they're using off-the-shelf components to build their pickups (it seems both StewMac and Mojo have all the parts one would need, and I haven't even looked for other options). I would also guess that Throbak (et al) is expensive because they are recouping costs from using custom metals, magnets, etc., in their effort to be more "authentic." Does either approach negate either being a true "PAF" style pickup? I don't think so. Do all those custom components make a difference that one can hear? Well, depends on how good one's ears are, but I think it does, but those are nuances and may or may not be important to me, you, or anyone.
There really seems to be about 3 different price points (without considering things below the "average" pickup, say $125 each). There are a number of options that are right about "average" or about $200-$300 a set. Then there are another group that are above average in cost, say $400-$600 a set. Then there are a handful that are in the stratosphere, say $800-$1000 a set. Any of those pale in comparison to used sets from some winders no longer in business (Tom Holmes, OTPG, etc.), and look miniscule in comparison to actual vintage PAFs or even their later variants.
FWIW, while I haven't ordered anything from Amber, I have ordered from several businesses in Germany (notably Thomann) and have never had any issues. If you use a credit card, you still have the protections that card/bank offers you, and any customs duties were handled by the shipper (DHL, FedEx, UPS, USPS).