Re: Weapon Summoning
If I understand your concept correctly, the weapon cannot be taken away, lost, etc. If that's true, Focus really isn't an option. If disarmed, for example, he just manifests a new one (and I'd assume the first would disappear).
I'm thinking Linked is the simplest way to go with your End Drain, assuming again that you must strike the opponent's body (HKA) to strike his Ki (Drain). That would cover the requirement of having the Spiritual Weapon available.
Or... make them slots in either a Multipower or an Elemental Control.
Killing Attack - Hand-To-Hand 1d6+1 (20 Active Points); Limited Power(Must pay END every phase; -1/2) 13 Real Cost
Drain END 2d6 (20 Active Points); Linked (Killing Attack - Hand-To-Hand; -1/2) 13 Real Cost
Of course, there are probably at least another dozen ways to build this. That's the beauty of the Hero System
Edit: re-organized my thoughts