So quick tip, sharing from what Necro_Infernus discovered, during infinite loading bug in AC MP, simply hit backspace once to initiate auto-destruct and wait for your ship to blow up.
The bug is that the loading screen won't go away even though you are spawned in AC multiplayer map with everyone else. But getting blown up and getting the respawn option will get rid of the loading screen and allow you to press X to respawn. You lose a life this way but it at least allows you to play to unlock the pirate gladius and pirate cat. The pirate gladius Warbond has LTI and is $90.
I used the Vanguard Sentinel with Ballistic canons on the nose and Gimbaled Attrition (the 2nd energy repeater) and the class B military coolers from some other ship, and x32 size 2 missiles by using the 890j missile racks, albeit it seems to not register all missiles in-game, but having those 890j racks do allow 8 missiles per rack and you can put four of them on the vanguard. Also, to enable your EMP which is off by default, you have to enable/turn on your second weapon group from your cockpit console, by default it's your lower right screen IIRC.