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If your edge looks straight enough to hone, HT it. We never know until we try something new. If it doesn't work, well, we learn more from our failures than our successes. If it was me I would put...

I thought just maybe. I have a very limited shop at home myself. Hand and basic power tools, with a bench grinder and shopsmith. Anything precision I do at work.

You have a surface plate. Do you also have a precision grinding vice and a height gage? You could clamp spine in vice and use the scribe.

You could also use an angle plate or other "square"...