Can I pretend to be casting from a spell scroll, but instead cast normally, or vice versa?

I’m wondering if, while I’m casting normally I can pretend to be casting from the scroll I’m ‘reading’ in front of my eyes. Or if I can do the opposite, read a scroll while pretending to perform a spell using falsified verbal, somatic, and material components. I have devised this as a shenanigan for fooling a mage with counterspell. Which is the main strategy my character would rely on for dealing with pesky mages.

Note that 5e doesn’t specify what it means to read. So I’m using the lexical definition that google gives for what it means to read:

“[To] look at and comprehend the meaning of written or printed matter by mentally interpreting the characters or symbols of which it is composed.

This would free up the verbal component needed to cast spells. I’m fine if an answer refutes this last point as I understand 5e doesn’t define the requirements for reading a scroll.