Silly question perhaps - but why not Amiga rainbow check mark mouse, Amiga rainbow check mark keyboards etc? If I remember correctly, the Amiga check mark is not an active trademark anymore, so anyone can use it, and it (from my experience anyhow) a much more recognized symbol for Amiga.
And it is so much nicer than the boing

(and this reminds me I should visit the local T-shirt shop to see what they can do for a big nice Amiga rainbow check mark on a kickstart 2+ purple T-shirt)