I haven’t purchased Orbx 61B as yet but did have elevation and duplicate runway issues due to conflicts with P3D’s 61B and updated Navigraph/fsAerodata for KBVU. I fixed it by disabling (not deleting) the conflicting 61B files. If Orbx doesn’t provide some means (optional patch perhaps) of correcting the ICAO designation, then those of us who receive regular Navigraph/fsAerodata updates will have a problem. I do very much want this Orbx scenery though for sentimental reasons.
I do find it interesting that Orbx went with the old ICAO for 61B but went with the new ICAO for KGPI, formerly KFCA. I had similar issues there when I installed the Orbx product and fixed it similarly by disabling the duplicates.
Another means to eliminate conflicts with Navigraph/fsAerodata is to ensure they are below any Orbx/FTX entries in the scenery config. Doing this eliminated a problem with elevations and duplicate runways at KFHR. You may lose access to updated approaches, etc however.