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Weight is a red herring. Don't get confused.
Its about what you need and being robust and reliable.
OK so no carbon (I couldnt afford either) and alu is just find. But get a good alu rim and have them built by the best wheelbuilder about.
Rr is a road rim, id is 22mm. Its not really suitable off road. Yes it might work but will be at higher risk of damage.
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I haven't used the DT rims that are on ebay set has, but I have had the cheaper r460 and 470. Good rims otherwise but pretty easy to dent, especially the r470 that has thinner walls. And when you let the pressure out, tyres tend to drop off the shelf. So if you get a flat and need to put a plug in it, you'll need a good pump and the stars to align to get the tyre back up or use a tube. These rims have sharper edges so are more likely to pinch flat the sidewall of a tyre than a mtb rim, though that seems to be true with most road rims. The WTB Kom I have on the bike's other wheels are much less sharp, as are the hookless carbon rims on my mtb. You shouldn't have to worry about this on tarmac, but I have dented two rims during TCR on bad tarmac, with pressures a bit too low.
Feels like a balancing act between weight, price and durability in the end.
Spending an extra £500 to save c.200g on a set of carbon dynamo wheels vs alu seems like the wrong way to go.
Similarly not sure I can face putting a heavier XC rim on when the main goal this year will be on tarmac. The Ebay set starts to look like a reasonable option.