But you already gave very good suggestions of "putting a dummy struct variable upstream of your sizeof calls."
Please show me in code what and how do you do that, if you understand what you mean.

Do you know what the code above performs?

Supervision can be given only on proper code. Not on poetic notions of code.

You always project your own boundaries on reality, which you want to go beyond, but only a few who walk the talk can put it into code...