The answer is yes. You can put any OS on your phone you want.
***AS LONG AS YOU BACKED UP***
Unfortunately to do a roll back you will probably have to backup, wipe the handset, remove the unwanted OS from your pc, then install the one you want onto your pc.
Plug in your newly wiped phone. Once it picks up install as prompted.
Its is an easy process for someone who is slightly technical. If not there are instruction but do it with care.
However there are always those of us here to give you help and advice.
OS10 on the Z10. A great combination.