I picked up a 3d printed morse key online. It’s pretty cheap yet it feels solid. On the radio side, there’s a built-in keyer circuit. This circuit is set up so that pressing one paddle produces a stream of either dots or dashes as long as an electrical connection is made. That’s old news to any ham, but I thought it was kind of cool.

Morse key top view

Morse key back view showing plug

Morse key disassembled showing interior