while true, you still want luck to play a factor and send you extra.... otherwise you're in for a LONG grind....
you need 50 AP and 3 idea cores to even start one... so assuming you don't get ANY as extra drops... you'll need 6000 AP and 360 cores to MLB a weapon this way....
that's cause it's 30 regalia for the weapons and you'll need 4 copies (one master copy and 3 to MLB).
considering that, i'd rather wait until the trade shop is fixed....