I haven't tried (I prefer to use ciangel for the updates just to be safe) but I think accepting directly instead of going to the eshop page to get the update should work. Otherwise I suppose there's a risk of having your dlc deleted if they're pirated.
Well I tested it using Terraria. (small simple) and it works fine.
By the way What difference does CIAngel really do compared to this method here? I do like the download cia for later use but other then that?