Listen to professionals answer the phone and you'll wish this simple feature was added to their phoneset.
A button for the thumb seems right, but make it a chin switch if you desire, that layers a short audio track into the transmission to enhance those delicate first few words when making an impression
is so important.
"Good morning, this is … "
[press]
* digital pinging * Professor Aliteral * digital pinging *
or,
"Yes, this is … "
[press]
* funk * George Clinton * funk *
"but please, call me … "
[press]
* echo * Mr. Clinton * echo *
Maybe a portable personalized version built into a ring or necklace would be the way to go.