Did you solve it?
I'm trying to create a proper ppp connection but I'm lost right now. Where did you find anything useful about it? Can you share it with us even if they are just documents?
I checked esp-modem component's way but I really didn't understand how they started PPP communication, I know ...

I learned how to do it. There is some ways, first
You can add command to bypass it, "CMAKE_BUILD_EARLY_EXPANSION" is only set enumeration step. So we can bypass it. Or we can still use "idf_component_register".

As far as I know and tested you can use whatever you want but you HAVE to port it for it. Create a bootloader components and send these inside of it. I suggest you can write basic functionalities of these you mention it but use bare functions you should not keep it long or try to use unloaded parts ...

I have a project with a lot of CMake logic integrated to it. I want to bypass enumeration step of build process so I no longer see "command is not scriptable" error when building. How can I do that? I can not use idf_component_register before this logic because this CMake has not a component but two ...