2 deleted 8 characters in body
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Python, 5446 bytes

lambda x:"".join("0"*(j<'j')+str"%02i"%(ord(j)-96)for j in x)

Pretty straightforward. Try it on repl.it!Try it on repl.it!

Python, 54 bytes

lambda x:"".join("0"*(j<'j')+str(ord(j)-96)for j in x)

Pretty straightforward. Try it on repl.it!

Python, 46 bytes

lambda x:"".join("%02i"%(ord(j)-96)for j in x)

Pretty straightforward. Try it on repl.it!

1
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Python, 54 bytes

lambda x:"".join("0"*(j<'j')+str(ord(j)-96)for j in x)

Pretty straightforward. Try it on repl.it!