I would not want to waste time on doing such conversion. By doing so you are actually telling Lightroom to use the profile of E-30 to demosaic E-5 ORF, which in my opinion, will not optimize the image quality of E-5.
Wait a while, Lightroom is due to release their final version for v3.3 (it is now a Release Candidate), which I think may include their support for E-5.
Really? Finally! Most probable support for E-5!