You could absolutely do the -2 variant, no problem. It’s fun (I SAID WHAT I SAID). FTP doesn’t matter, I did -2 in December last year at 148 and this year at 202. It all scales. It’s an impossibly fun experience to do it with a group, so big recommend from me 
If you haven’t done much threshold or sprint work, the harder variants would be a rude introduction and a real endurance stretch, but it can be fun to find those edges too! You might surprise yourself. I’m planning to do -1 for the first time in September, and the full version in December. I don’t know if I’ll survive, it’s gonna be an adventure.