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Once thoroughly dry, likely oil will be harder to remove... after a year or so of drying time ;-)

Why do you want to scrape it off?

A fun ideas I had. It’s thrilling to see something beautiful destroyed. I may film the entire process.

If you use acrylics in a thick enough layer and then put it in hot water, you might be able to pull the whole "painting" off in one piece!

Ah. That sounds interesting. I got a really large sheet of glass so I’m guessing that I could probably soak a towel with hot water to achieve the same results.

Hm.. never tried that, but it may just as well work. Important with a big sheet of glass is, that heat is applied rather slowly and evenly, so it won't crack...