Embedded Evolving CFG files

[Pappystein]

I am wondering, Is there a way, without plugins, to have a single CFG file alter itself from one career unlock to the next.

When I say Alter itself these are the things I am thinking about:

Change Cost,

Change Weight

Add Features

Change IVA files

Remote obsolete features.

For example, Could I create a single CFG file to use both the base FASA Gemini capsule and then when unlocked, alter the Gemini so that it is now the MoarDv Updated Gemini with Glass cockpit IVA, a lighter launch weight and a higher cost?

I know that certain mods unlock more features as time goes by (MechJeb comes to mind,) but I have not seen any mods where EVERYTHING can change, nor have I seen one that did not come with a plugin.