For navigation:
Kensington Expert Wireless Trackball – big enough to use without precision, scroll ring around the ball, sits anywhere
8BitDo Micro – programmable Bluetooth gamepad, works as presentation clicker + arrow keys, very hackable
Xbox Adaptive Controller – overkill but lets you plug in literally any button
For voice:
Wispr Flow (you're already using) – good
Talon Voice – free, hackable, lets you control everything with voice + eye tracking if you add Tobii
Windows Speech Recognition / macOS Dictation – basic but built-in
The streaming remote hack: Yes, you can. Most use standard Bluetooth HID profiles. Pair them, then use something like JoyToKey (Windows) or Karabiner (macOS) to remap buttons to keyboard shortcuts.
My current lazy setup:
Recliner + lap desk
8BitDo Micro in left hand (next/prev/play/voice toggle)
Trackball in right hand
Voice for text input
Feels slightly less caveman. Slightly.