A quick tip - if your efforts don't seem to be working, use the 'sharpie' method and paint the edge with a marker so that you can see where you are scraping material away while sharpening, then simply cause the hone to interact with the edge such that the marker is removed from each bevel-face all the way up to the apex.Thanks for the advice I really appreciate it
Yup. Just sharpen it like a regular edge and don't worry about maintaining the convexity in the field. You'll be making a bit of a convex with freehand sharpening anyhow, and the main advantage of a convex is that it's like a flat bevel with the shoulder blended off, reducing thickness at the bevel transition. So if it thickens up over time with field sharpening, just knock the shoulder thickness down again.