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About your very long launch time, it must be because each time you use geomod, the tool 'remake' the historic_events.txt.strings.bin when you save your work, and it does it wrongly/weirdly.
As far...

Don't worry, modding eat free time away beside real life I know. Glad that you got your campaign to launch. Remember now to always keep back up of working files and test things very often, always in...

Aïe, aïe, I think I got it. Forget the deleting region one by one for now, though the delete function in geomod should work fine if you ever need it.
But your problem is elsewhere, before I had just...

Ok I quickly corrected your wrong faction creator slave with replace all of notepad++. I putted england everywhere instead, see the attachment download, think of deleting your map.rmw if you have one...

slave is the internal name of 'minor factions'. You can set any faction as region creator, except the slave. However it shoudn't cause a crash, the game should temporary set them to your list first...

Well it doesn't appear obvious. I have the same error trying to launch your campaign, and the system log say:
can't setup slave faction as the default faction for this region
For most if not all...