Poor man's quick shifter

[gadget226]

Hi team, I have recently acquired a cbr250r as a project, and during the mandatory research phase due to the potential for a track bike toy, I came across this diagram for a quick shifter.
For all the tech heads out there, would this be possible to achieve on a busa?
The only issue I'm having in my understanding of how it should work is the switch, I'm thinking I'd have to run a relay in there as I'm not aware of any push button switches that break the connection instead of making it (like a horn button etc)
For shits and giggles I will be attempting to make it work on the 250, and will update the results.

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