I received the replacement HP EliteBook 840 G4 keyboard with Swedish/Finnish layout a couple of days ago.
Herein lies the tale.
The proper HP part is 836308-B71: Backlit keyboard assembly. However, since it costs 120€, and I rarely use the keyboard backlight at all, and this is already a few years old, I opted to go for the cheaper, non-backlit assembly 836307-B71 instead, which costs 64€. Yes, indeed: the backlight LEDs cost 60 euros. Otherwise the keyboards are identical, including the pointing stick ("nipple") between G, H, and B keys.
Well, I cannot really begrudge HP for the price: at least they have these spares in stock, and the price for the non-backlit one is very reasonable (considering how few Swe/Fin layout ones are in use, compared to e.g. US, DE, FR, UK, and so on. Although the price for the backlit one is high, it isn't outrageous. HP also shipped it very, very quickly: from my order very early on the 27th, it was already here in Finland the next day at nine in the morning.
UPS, of course, completely botched the tracking. It first stated that it would be delivered by the end of the day on the 28th, and when the day changed, it turned into "we'll let you know".
On the 29th, UPS still had no idea when it would be delivered ("We'll let you know when we know the delivery date"), so I had a epiphany: I wrote a grocery list, almost put my coat on to go to get my new years groceries, but instead just sat down waiting. It only took fifteen minutes for the UPS guy to knock on my door, with my keyboard in hand!
(I know that sounds unlikely, but it is true. It took me a couple of days to believe it worked. No, I am not prone to magical thinking or superstition; it was just too perfect an experiment. I just didn't believe it would work. Probably should have bought a lotto ticket?)
The keyboard seems to work perfectly. There might be some tab differences between the 836807-D71 (non-backlit) and 836808-D71 (backlit), in the lower left corner, as I now see one of the tabs is not seated correctly. Not a big deal to fix, which I'll do right now. Edited: Nope, the two match perfectly, it was just dirt blocking the tab slot on the plastic chassis; so, the only difference between the two is 836807-D71 does not have the center FPC cable for the LED backlight. Functionally, no complaints.