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That is Iwasaki's method. Western style works just fine.
Just to avoid confusion the contact is not on the spine where most would think. It is at the tang.

Sorry I misunderstood. Though thought were trying to strop with your finger on the spine.

You can practice the dexterity for the flip with a tooth brush if you want. Same principle applies but as you have a razor may as well use that. Once you have the 180º rotation down go to the...

I suggest you abandon that as a technique & learn to hold & flip the razor traditionally. No reason you can't have stropping down after a couple of hours of correct practice.
Shaving skills may...