OP you can absolutely do this safely as long as you use an oil that is rated for such long mileage, and a quality filter (not Fram, use Wix/NAPA Gold/Carquest Premium, Amsoil Ea, Mobil-1, OE, or other quality filters).
What you should do first however is take an oil sample (properly) from your current oil run at the end of its oil life when you change it, and send it in for analysis. This will tell you whether you have anything going wrong in your engine that would make running such a long OCI inadvisable. For instance, many people have coolant leaks and never know it. Running a long OCI with acid building up in your engine wouldn't be a good thing.
So, you'd:
1.a.) Change oil and filter to long OCI capable oil and filter.
1.b.) When draining out oil, take sample.
2.) Send sample in while driving on now long OCI capable oil and filter.
3.) Get results back.
3.b.) If results indicate no issue, then happily run long OCI's.
3.c.) If results indicate issue, then consider getting issue fixed before going long OCI...or at least accept greater wear and/or risk.
A common long OCI oil would be Mobil-1 Extended Peformance. Amsoil would be another, but beware they have a normal OCI line and an extended OCI line. Also, I believe you need to run their filter (which is a great filter, but, expensive) if you want to be covered by their guarantee.
Chuck