PS+MS will only consume one stack of Zen, that being said it is entirely possible to do the same rotation endlessly.
Dummy Opener:
Zen>TST>ZS>BR>PS>MS>CB>Strike>BR>BR>ZS>PS>CB>Disp
If you activate Inspiration right before the first PS window you can get the second CB buffed by inspiration, this is very tight and tricky though.
After the opener you exit your second PS window with 20 centering and continue on with the following:
BR>Dispatch>BR>Zen>TST>BR>ZS>PS>MS>CB>Strike>BR>BR>ZS>PS>BR>CB.........
This rotation is focus and centering neutral and you should be able to Zen like clockwork every time. There is only one BR under Zen placed one GCD before the MS+CB window to for the extra chance of ataru procs.