Wish Underscore in package name

The company's site starts with number and I have trouble renaming the package correctly.

For example:
123name.example.com

the convention would be:

com.example._123name
(but this is not possible in b4x)

reference:
https://docs.oracle.com/javase/tutorial/java/package/namingpkgs.html

Please, I need to use the correct convention.

Thank you.