[Apex]

I say don't mod unless you like the track day.

Find someone local that will be going as well, or maybe even rent a truck. My local track day organizer will let you rent leathers. That way you get an idea of what it is like at the track before you invest a ton of money into it.

Level 1 group always takes it easy. Ride with a clear and focused head, you and your bike should be fine.

I'd personally just keep the bike stock, test the waters, then if you like it jump in.

Just stash the cash. If you like the track day and want to continue running track days, then invest the $$$.