Sarena,
In your situation I'd try slowly dropping the carbs (shooting for finishing at half the standard Zone allotment) before fully jumping into IF.
Or you could do the gradual "moving back" of the first meal of the day, meld it into your midmorning snack, then push both those back into melding with lunch, and then get both meals within your predetermined window.
Either way, do it stepwise and gradually so you can observe all the changes. Maybe you'd like to keep a log here so we can keep an eye on it.
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