Hi,
If you have you have enough space, an "extra" oscillator is never superfluous, and the STO is a very good module. I would remove the Fold 6, one of the strengths of the Piston Honda is the wavefolder circuit.
I would add some mutes before the mixer, but that's because I really like "mutes".
Here you have some without "clicks", with vactrols.
https://www.modulargrid.net/e/divkid-mutes
Perhaps I would also add another Triplatt, it is quite cheap and you have a lot of modulation signal, sometimes it is interesting to mix them.