I missed the keynote flavour at first sip, but noticed the drink gets more balanced after a few minutes. Probably due to the shaking instead of stirring. The amount of orange juice used does not necessarily require shaking imho. Going to try with the suggested Blue Curacao.
Considering a Martini is after all an all-booze drink, with no fruit juice and syrup, I would replace the 7.5 ml orange juice with the same volume of orange Curacao liqueur.