You are right, erythritol appears to elicit similar platelet activation responses.

I'm generally skeptical about the sugar replacements, as the human body is unaccustomed to the quantities we expose it to when we use them as substitutes. And I fully endorse your experience of the unsinkable desire for sweet stuff during keto restriction. It's what makes me break the pure keto diet after a few days. Not with sugar, but with pasta.