I was able to change some kits in the kits table; I switched my team from a yellow visitor kit to some other team's white kit. But you'll have to tinker with that, overwrite your team's kits with others. The options are limited though.
Names cannot be changed in the tables, they might be accessible to edit in the meta file (other half of the db file). Open in Notepad and maybe see. Regularcat knows how to do that one, PM him maybe.
Frosty Editor is out and working, I got the full db to edit and load in-game. That's maybe what you need to start looking at if you want to make all these edits.
Now that you are working with Frosty Editor, can you tell me if editing BodyTypeCodes using FrostyEditor+DB Master and then importing the edited files (fifa_ng_db.db and fifa_ng_db-meta.xml) will mess up my current Career Mode save?