I just noticed that there are some centered backlit PBT keycaps available on AliExpress that would work well if you need backlighting for typing at night but have a keyboard with south-mount LEDs. There’s four or five different colorways in the Womier store under “110 PBT XVX Backlit.” Make sure that you get the 110-key sets; the 180-key versions are not backlit.
If you’re still kicking yourself for missing the LTC LavaCaps last year, rejoice!