For those who don't know what a POK3R keyboard is, this is a decent review.Multiple sources to buy, e.g. amazon, mechanicalkeyboards.com

• Best Cherry Mx Blue Keyboards

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The following layers are used in either OS:

Best Cherry Mx Blue Keyboards

• Windows: Layer 2 (blue LED), switch to it with: FN + ,<
• OSX: Layer 3 (red LED), switch with: FN + .>

General POK3R programming info

• POK3R User Manual; Vortex keeps shifting their URLs, so local copy (thanks @couto, @josephfusco)
• Factory reset: Hold both the left and right ALT keys
• Reset selected layer only: FN + R until LED under spacebar stops flashing

Programming of layers 2-4:

• Default layer cannot be programmed
• FN + R_Ctrl (use L_Ctrl if FN has been reassigned already) -> second LED under space bar is now lit
• hit target key, then: new content (can be up to 32 char), then: PN (second LED will blink while programming)
• FN + R_Ctrl to exit programming -> second LED extinguishes
• During programming, use the keys as labelled on the keyboard, irrespective of any reassignments

Layer 2 (Blue) for Windows:

FN + ,< to switch to Layer 2

• FN + R_Ctrl to enter programming
• FN + R_Ctrl to exit programming

Resulting programming:Windows Layout on keyboard-layout-editor.com

Layer 3 (Red) for OSX:

FN + . to switch to Layer 3

• FN + R_Ctrl to enter programming
• Swap Cmd/Opt keys on both sides of space bar:
  • L_Cmd: L_Alt then: L_WIN then: PN
  • L_Option: L_WIN then: L_Alt then: PN
  • R_CMD: R_Alt then: R_FN (Win) then: PN
  • R_Option: R_FN (Win) then: R_Alt then: PN
• FN + R_Ctrl to exit programming

Resulting programming:OSX Layout on keyboard-layout-editor.com

Common key bindings for all OSs

• CapsLock always as Ctrl:
  • CapsLock then: L_Ctrl then: PN to confirm
  • FN + CapsLock then: L_Ctrl then: PN to confirm
• VIM like HJKL and Page Up/Down:
  • Left: FN + H then: FN + J then: PN
  • Down: FN + J then: FN + K then: PN
  • Up: FN + K then: FN + I then: PN
  • PgDown: FN + F then: FN + O then: PN
  • PgUp: FN + B then: FN + U then: PN
• Home: FN + I then: FN + H then: PN
• Volume controls:
  • Mute: FN + X then: FN + /? then: PN
  • Vol-: FN + C then: FN + ,< then: PN
  • Vol+: FN + V then: FN + .> then: PN

Move FN to L_Ctrl

HJKL as cursor keys are more ergonomical to reach by moving the FN to the left Ctrl key location:

• Switch to Layer 2 (or 3, 4); this programming is per layer
• Unplug keyboard
• DIP switch 4 to ON
• Plugin keyboard again, then press FN then: L_Ctrl then: PN then: PN (to leave it in its original location)
• DIP switch 4 back to OFF (no need to unplug)

Sources

The how-to for these mappings is from 2 reddit threads:

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