You can’t maintain that your preferred name is presently valid and invalid at the same time.
“sensu” is the right term to use.
If someone should reject section Vaginatae on nomenclatural grounds, I can still use my “sensu” construction and be understood without criticism. That has been one of my concerns in using “sensu Zhu L. Yang.” It is also the reason I use “section Lepidella sensu Bas” (see Cui et al. paper as justification for my concerns).