I had to rethink this a bit. To cut a long story short, IR itself needs to contain at least some explicit support for DSB or it will all just break really, really hard.
I am going to go ahead and release a separate patch mod for IR+DSB. I don't actually ever play with DSB enabled myself any more so that will probably be the end of it for me - as the original author of DSB I mostly just didn't want it to be completely incompatible with IR.
So I am happy to add you as a collaborator on the DSB-IR support mod if you want. I wouldn't mind if you wanted to expand it later to stack things that I haven't provided by default (e.g. ores, crushed ores etc.)
Alternatively you could just keep providing this mod here to extend DSB even further, it's no skin off my nose either way. But currently IR won't run if DSB is installed but the DSB-IR patch mod isn't.