Enable Voice Over

Go to Settings and then Accessibility. Now go to the VoiceOver sub menu.

Wait to enable Voice Over until the keyboard is paired via Bluetooth.

https://support.apple.com/guide/watch/use-a-bluetooth-keyboard-apd006574536/11.0/watchos/11.0

Set the modifier key to "caps lock". The Up button on the ANO encoder is setup to start up the keyboard with caps lock key.

Setup 3 button press with the Crown button to turn VoiceOver On/Off: https://support.apple.com/guide/watch/the-accessibility-shortcut-apda74993b58/watchos

Navigation buttons

The scroll wheel scrolls either up or down, left and right arrows do the same, center button is used for double tap to select and down button reads out the characters.

Pair Keyboard

Inside the VoiceOver settings, tap on the Keyboard sub menu. Under Device, tap on the CIRCUITPY device to pair.

Disconnect Keyboard

If you need to disconnect/forget the Feather from BLE, you can hold down the center select button on the encoder while power cycle the Feather. 

If you're connected to the repl you'll see "Last BLE bonding deleted, restarting.." and then the board reboots.