Sorry- i thought there was a routine already with this in mind
and i have tried this first hand- a month ago i thought of Five-speed, and i was quite fond of the idea. but i havent got the money to buy the effect, so i thought of Colour-monte and incorporated that into this.
it helps if you've got two similar jokers for the specs to see- and a standard third random card. Just quickly swap one of the jokers for the card beforehand and execute colour monte. simple-as.
Reactions were okay- Though some did say it was a bit predictable. i think it was my reputation as a magician in college that made that reaction instead of the effect though.