When in secondary and direct modes the control column deflects the elevator directly which is powered by the L HYD.
But in your scenario of having both stab cutout switches to cutout, and also being in secondary mode, I am not sure what kind of trim is available (unless the altn pitch reverts to some purely mechanical mode bypassing the STCM).
Check this link, it suggests that the altn pitch trim is controlled via cables if need it be.
https://www.google.ae/search?q=b777+...mKkJ86SXVIwhM:
Cheers