Even assuming you shouldn't be doing it, the lbrp isn't too heavy a ritual to cause serious problems, I think.
However, I do not see any reason why it would be seriously detrimental to perform the lbrp while beginning the IIH anyways.
I would only suggest abandoning the lbrp if you are infernally inclined, and would like to keep it that way.
My only thought is that it will be interesting to you to see how your development in the IIH affects your ability to perform the lbrp, and increase its effectiveness.
