If I didn't manage to do White Oak Doors before Makoto's final event, is she 'locked' until next patch (similar to Nodoka and Yumi?)
Yes, in the sense that there's no way to build lust with her. But, as she is "recovered" by the end, (doesn't look like a junkie) it may be a case where you have perma-locked yourself out.
What I did, since I was in the same scenario, was I used (Ctrl-O) to access the console, then 'jump matokolust30' since I am used to how they name their scenarios. This put me in White Oak Doors, I got credit for it, then I jumped to other Matoko lust events until she had enough lust to back credit myself.
Ideally, I think the best approach is to find the minimum stats to activate an event, get 5 more after that, so you are already ready for the "next" event. Then rinse, lather, repeat as you get new events.