Well, One Single Cut is all about Sundering stuff, not about making it fixable afterwards. If someone can come up with a reasonable feat or class feature that would have that, though...
Speaking of minor things, I think I'm missing a skill or two that I planned to have in Arhosa... Will have to think on that.
I would be willing to write up something (ACF?) that replaced the Fast Healing of the Champion for a minor benefit based on which Forte you picked. (Obviously, the OSC would be the ability to easily repair things you sunder, from the purity of your blows shattering it
just so.)
That, or I can point out that though lives were certainly not expendable for the Heginyn and their swords apparently were, resources such as exquisitely enchanted swords were likely not in abundance - destroying years of effort and work for a single duel simply isn't practical, and as such it must have been likely that they could recover the swords, or at least the magical essence of them (a la
residuum from 4e, or an artificer's craft reserve in item form).
(Make Whole doesn't repair enchantments, by the way)