interesting, but it specifically calls out the right hand or forehead.
Some translations slightly differ from the word "mark". I see "brand" or "character" or "stamped upon them a mark"
https://biblehub.com/revelation/13-16.htm
the original greek word translated as "on" is a preposition, and can mean on, in, into, unto, etc.
https://en.wiktionary.org/wiki/%E1%BC%90%CF%80%CE%AF