The original Solar Phoenix build was based on Kamas:
http://forums.ddo.com/showthread.php?t=238298
You'll even see an earlier post on this thread where a guy was complaining of spending a lot of time getting his dreamedges, only to see the 'build' change.
The drawback of that original build was the damage from kamas was a little weak. But it was workable before. Saving the two feats for longswords means
a) two more toughness feats
b) not having to hit a monk stance every time you log in.
c) You'll get to look silly waving around two garden tools all the time.
d) you'll get to do less damage, all the time (1d10 17-20x2>>1d8 19-20x2; in the case of your offhand healing amp weapon 1d10 17-20x2>1d8 19-20x3, holy+good burst>>>>>>maiming, and who needs vampirism when your healing curse is curing you 4-8 every hit?)
The dream edge is a light weapon, so you could use that (and other kamas) in your off hand, making the OTWF feat useless and therefore swappable.