I am more than a little impressed. I started that level 3 plan, and ended up dropping back to level 2, which I recently finished.
I found trying to do the Endurance rides on an indoor trainer a bit much.
I’m a Randonneur, and have a bunch of events coming up, one every 2 weeks, so the notion of preparing for “an event” wasn’t really meaningful for me.
In level 2, 3 of the last 4 weeks are tapers. Do you need/want that much? If not, skipping 2 of the 3 could give you 2 of the weeks you need.
I’d recommend completing week 1, and then picking one of weeks 2-4 to give you the third week.