[mothered]

I ordered a pair of Airpods from Amazon.it (200€) and a single protein bag from myprotein.it (35€), 2,5kg of product (I hope that my greed had not made me fail this SE)

(I hope that my greed had not made me fail this SE)

You haven't ordered from the same company, so It's fine.

I plan to do EB with Amazon and a refund for bad product quality with myprotein (I do not know the name of this technique, if it has one)

Both methods are well-suited to the nature of each Item.

If your SE Is executed effectively, I can't see this failing.

I like to plan things 100%. Reducing the possibilities of failing and risk my cover.

Preparation/formulation of a given method Is paramount prior to hitting the SE.

"Predicting" outcomes, Isn't.
All the very best.