Yes, it will take these ideas and more. And we probably need to engineer the bacteria so that it can survive outside - that is the only way that it can replicate exponentially (because nothing will be competing against it).

And as some commenters here have mentioned, we need to create a magnetosphere.

The technology that could make these things possible is self-replicating machines. That will be necessary to reach the scale that is needed.

But if we could do it, imagine: creating an entire new planet. It would be the biggest achievement is our history as a species. We will have to put on our "adult pants" to do it.