Vassal of Bahamut

[Goaty14]

You can downgrade a standard to a move (PHB 138), and a standard to a swift (through Ready, at the very least), just not a move to a swift.

Couldn't you get another swift through another full-round with a Belt of Battle? Though at that point you could just full attack twice and be done with it.

For the duration problem on wraithstrike: it is quite possible to Extend the spell, although that does require a custom magic item, or some kind of Sudden metamagic that works on potions and doesn't take an action (is there a power component that works with potions?).

Metamagic Wand Grip?