Dualboot

Id recommend to use tunnelbear as a VPN, when using (nordvpn) before i couldnt join specific servers (in different games) or in any other game due to using a VPN, but when i switched over to TN i never experienced the issue again. And to your question spoofing only changes ur hardware ID, it doesnt affect anything with your IP at all. So yes you should be able to run both at the same time without any issues.

Well Fortnite uses Battleye as an anticheat and if you do get banned you most likely will get crossbanned on new account due to having a ban on your HWID, which results in you needing a HWID spoofer in order to play those type of game due to your bans in the past.