An idea to make sona less 'brainless'?

Sorry for the title, I'm not hating on sona mains. My brother is a sona main and he loves this idea. I'm wondering what other people think.

I just read a post about Sona being a QWE spam bot and you might as well use a macro to spam these keys brainlessly during the lategame. And they're right.

In that post, it was also mentionned that sona feels (or should feel?) like you're playing a keyboard, where you tap multiple keys in some sort of rythm.

My suggestion is to give a new passive to sona where she shifts colors (blue, green, purple) and whenever she casts a spell that matches the color currently on, her ability becomes empowered (in whatever way, still to be filled in). Now, this 'color' will switch in a semi-random pattern like Guitar hero or dance queen. So it will look a bit like TF's pick a card, except that the order shouldn't be strict.

Not sure yet how this new passive should be displayed or how long it would take before it rotates, but I just came up with this idea and I think it would be pretty cool. Sona doesn't have to aim with her basic abilities, just position well and keep an eye out. This could be an additional layer in her skill, where she's still unique to have auto-aim, but will require a more rythmic skill rather than a precision skill like other champions. I think this really fits her identity and playstyle.

Do you agree? Any tips on the specifics or how to implement it?