Hi Joy,
Welcome. Sorry to hear that your OH's PSA is on the rise, here's hoping that your oncologist will suggest one of the ideas you have or others have mentioned here. If it was me, I think I'd rather have abiraterone before Cabazitaxel but I'm a wimp and it's not my choice. It certainly works differently from enzalutimide so no need to assume it won't work.
A couple of our members have had second rounds of doxataxel but perhaps they did manage all their allocated original chemo, though one friend did 8 sessions only as Scorland does 8 not 10 (so they told me).
Good luck to you
Love Allison