P&P will have to correct me if I am wrong, but as I read the OSRIC license it is not exactly an "SRD" in the way the other documents are. Only certain parts are OGC.
An SRD can be used word for word, but OSRIC has only certain parts that can be used word for word. The original language in OSRIC is protected and can only be directly copied in short quotes. Am I wrong in this interpretation?
In this light, I don't think you can simply marry the two without rewriting the 1e algorithms. The OSRIC license does not extend to complete games either, right?
Now P&P is entirely in control of his work, so he can tell you what's up and what he allows, etc. This is just my interpretation of the license. I am no lawyer.
Not trying to discourage you from your concept, I'm just saying it will be a bit more work.