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is it possible to customize a native SCA Extension e.g. Advanced Signup

No but you could copy all the code and create a duplicate extension and go from there

Let me clearer actually. The above message is what you should do in the strict sense because we don't offer extensibility options for our extensions.

However, I have seen people write extensions that extend our extensions. This will technically work, but it can create a lot of fragility.

<@U8X7E86M6>’s solution works. I had a client that wanted some extra fields in the email signup form and using the SC Team's version as a baseline was waaaay easier than doing it all from scratch.

I suppose that's very similar to your original request.

Yeah. Just keep in mind that, like SCA, you're effectively taking ownership of the code so any updates we make will need to be merged in by you

If you use git, doing an initial commit of the baseline extension is obviously a good idea