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Yes, Kapton is a nice hardwearing tape, just be sure to apply it long enough that the back end is past or close to the stabilizer, or a bit longer than electric if using over electric tape, it can...

Just joint the edge, and re-set in 6-10 laps.

When you joint the edge, any edge on re-set is a whole new edge. Once the bevels are flat and in the correct angle you only need to remove a few...

You do not want to lap an Ark with a diamond plate, you will ruin the diamond plate, (rip the diamonds out). But you can ease a corner with a diamond plate under running water for a few strokes...