Unfortunately I think you're wrong about the amount of effort it would take to update the Earth Bow to 1.5[w] the fact that the weapons can have crafted effects added to them makes them hard to work with (I do agree it should be done though).
As for changing the Elemental Resistance to DR even if I agreed with that idea, I doubt they would ever even consider it the design of those weapons is for each to have a elemental protection not DR.
Visor of the Flesh Render easy enough to farm up 3-5 of them and then you have opened up a gear slot to a better effect. The spell also protects you from neg levels unlike the items and there really isn't that many negative energy attacks to warrant having a full time gear slot for it.
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Personally I like my healing less spiky and more consistent which is what the DT armor offers, along with about 10 more HP per cast on average. Also means you don't have to swap your weapon, add in Quicken spell feat and you can now heal in combat with out loosing a beat.
One last thing for some reason (even though ddo wiki says there BTC) I'm under the impression you can buy Stonedust Handwraps off the AH (maybe its the ASAH) have you checked?