Although it's not recommended at all , you can make these changes directly in the txt file.
Copy the existing file a couple of times (to keep a backup) and delete the lines you don't want to keep in each one.
You can modify groups aswell.
Regarding the third question, you can change the parameter names, keeping the GUID, BUT!!! Existing families and projects will keep the old name (although since it's the same GUID, they'll still talk to each other).
This can lead to situations like a new project with a parameter called ST_Height and a family in which that same parameter is called ST_hEIGHT.
The only way to fix this (that I've found so far) is to edit the family, delete the parameter with pyArchitect ("Delete Shared Parameter" tool), reinsert it, and reload the family into the project.
So, as said, you have to evaluate whether it is worth all the work, keeping the parameters as they are, or starting from scratch.
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