1. Let 5 harbinger-filled Ursas each ram the Lucifer's reactors. Bye, bye, big lobster.
2. As I already said, make the Bastion so close to the Lucifer, so when it gets destroyed, the incoming debris will shatter the Lucifer to pieces.
3. Have a decomissioned destroyer in Sol park right in front of where the Lucifer is supposed to jump from. No need to waste several wings of fighters and bombers. Then, as Lucifer jumps out, it crashes to the destroyer, pushing it from moving out the hole. It's too late, so subspace hole closes and finally slices the dang lobster.
4. Call the Volition Bravos, let them hand out a fishing rod, and catch the Lucy. Lobster for dinner, everyone!