1. Yup.

2. I use Audacity because it's super simple and has a familiar interface. Ardour is a DAW with way more features and mixing available, but a lot of people just use ONE as well for the "one and done" method. VSTs are going to be hit or miss depending on what they do and how they were written (many are windows-specific), but there are other things available for replacement if needed. Link.

3. NTFS is fine to read from on Linux, but I wouldn't suggest read/write because NTFS will 100% corrupt itself over time. Stick to either read-only from NTFS and save elsewhere, or copy them to a new destination and work from there.

4. There's a lot of info on these on Linux. Sounds like support for the Scarlett hit with kernel 6.8, so you'll be fine there. The Behringer EV1 should be standalone hardware, meaning it does it's work with the PC.

You can just run a LiveUSB of Fedora or whatever and try all this stuff out to be sure with no commitment. You could also get a second drive cheap and make this easier to test out fully if you really want and make the switch from dual booting a lot safer.

Either way, you have easy options to test all this out before even installing.