Ok, fine tuned my character sheet, adding what items I thought would be appropriate. When you said that I could remove the Swift Action from the Changeling and Returning properties, did you mean simply the Changeling Properties? Returning is a free action to catch the weapon beginning of next round. So, 50% of the Returning and Changeling price, which is 1/2 of 6k, plus 1/2 of 2k, totaling 4k. Is that right? I would think that it would be 50% of the property being reduced (Changeling), and if needing to increase that cost, it should be the cost of the magical weapon, without the added magical properties such as Returning, Impaling, etc. So, 1/2 of 2k (for it's +1 Magical Enhancement), and 1/2 of 2k for Changeling property.
Or is this a House Rule, as I have never encountered this aspect. It's a nice option, but pricey. I still think it would be worth it, especially for a Dragon Shaman. I will be saving up to take advantage of this option for sure!
Added the usual, traveling papers, id papers, darkweave explorers outfit, etc. Are you allowing, as the norm, a free suit of player's choice? I took explorer's outfit, as that's his norm. I only added 100gp for the Darkweave addition, to gain a +1 to hide in shadowy illumination or darkness.