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But Tom, you have it backwards! if you raise the spine for honing, and then drop it for the box, you will be hitting the top of the bevel, not the edge. It may not matter for stropping, ...

Problem is, the angle of the box hone may not be the same as taped.

http://straightrazorpalace.com/workshop/88386-rolls-razor-hone-restore-picture-heavy.html

Tom,
Have you succeeded? or is that pic a mock up? I'm pretty sure the back of the blade is as hard as the rest of it, so I thought tapping would be a nightmare. I would go with a shorter...

While you CAN tape the spine for honing, it will change the angle so it may not strop and certainly will not hone in the actual Rolls mechanism.
I did a complete work up on the Rolls here......

Once you get a Rolls honed on the stones, you can KEEP it sharp on the built in stone. But if its in need of a bevel set, the rolls hone will probably never get it there. Then can be a pain, ...