Way way more people use the Shaka to mean Shaka as opposed to call me. If you use that symbol to mean call me, I can’t really help you, but I’ve never actually seen that in real life after like 1995.
Unicode naming can be wrong (and it is here) and that’s ok.
I believe the Inovelli Blue Series dimmer switch does exactly this. I have it networked through some zigbee usb controller I bought and is entirely managed via Home Assistant. I haven’t tested it non-networked but I don’t think there would be any issue using the functionality directly from the switch.