You can try out MyScript Calculator, which is doing exactly that – https://www.myscript.com/calculator

I prefer to keep my handwriting over the printed symbols. This might sound crazy, but when I see my handwriting transform into printed symbols, I feel as if the system stole it from me. :) Another crazy take – it is more difficult to read handwritten script, so you slow down your thinking, which might help you to think more deeply. I can't back these claims with any evidence other than "I like it that way"..