Welkynd stones don't recharge items, they recharge your magicka. In Oblivion, you could recharge your items with vendors, soulgems, and varla stones. I personally like this method. I have a feeling that an enchantment regen would be kinda cheap, since you would not have to work at all for it. Although I liked the sword, I thought that Dawn/Duskfang was pretty cheap in Oblivion because it basically had infinite charge.
Or it could be used for very weak enchantments.
mostly I just want the effect for the looks mainly. I don't care to much about damage wether its +1 or +25.
Be nice to have 2 types.
Regenerating charge for weak enchanted swords. (like FONV recharger, weak gun but could use after a bit of time)
Also you can only have one enchantment for this weapon. No fusing of two types.
And then more powerful enchantments that can only be refilled by the soul gem method.