Unexposed option name is `None` when the parameter name is not a python identifier

I would like to have dots in option names. As click requires option names to be valid python identifiers, I would like to use unexposed options to make dots in option names possible, and a custom callback to store the option name somewhere:

import click


def option_callback(ctx, param, value):
    ctx.ensure_object(dict)
    ctx.obj.setdefault("params", {})[param.name] = value

    return value


@click.command()
@click.option("--foo.foo", expose_value=False, callback=option_callback)
@click.option("--bar-bar", expose_value=False, callback=option_callback)
@click.pass_obj
def cli(obj):
    click.echo(obj["params"])


if __name__ == "__main__":  # pragma: no cover
    cli()

In that situation, in the callback context, option.name is None if the original option name is not a valid identifier:

$ python example.py --foo.foo baz --bar-bar baz
{None: 'baz', 'bar_bar': 'baz'}

I suppose this is due to those lines:
https://github.com/pallets/click/blob/99015e1456b6952054fda8312b40ea646737168d/src/click/core.py#L2594-L2595

Ideally I would love a simple way to use non identifier option names, like proposed in https://github.com/pallets/click/discussions/2433.
In the meantime I would suggest to allow Option.name to have its original value instead of None for unexposed option. I would volunteer for a PR if this is accepted.

What do you think?

• Python version: 3.12
• Click version: 8.1.7

Start in src/click/core.py around the linked lines 2594-2595 and trace how an unexposed option gets its name. Reproduce the example with dotted and hyphenated options, then add regression coverage showing the callback receives the intended original name and run the relevant Click tests.