Oh my, arctika, that's a long ass post I totally enjoyed to read!
And you was first, cause I actually wanted to interpret the symbolysm in the Pv myself later.
I agree with your interpretation overall, but let me add something.
When she's walking in the city she's wearing the exact same outfit she has on the album covers. So it's actual referring to her own carrer and her image as Koda Kumi she portrays as the singer. The song and the PV are about her own carrer and about not losing yourself or better find your true self. Kuu actually said that she cried recording it.
Also those little snippets about confusing street signs, an traffic light going green and a picture about "your own life" adds perfectly to it.
And yeah, it totally fits the lyrics.