Mix your epoxy with micro balloons or talc powder until thick and spread it on after cleaning the crack with a dremmel. This makes it easy to sand yet still has strength.
I would still use a dremmel and make a wider (wheel size wide) grind down through it to almost the glass and then fill with what I said...pretty easy to do.
Fill it and sand it and paint it.
Your grind would be wide not like slicing the crack open.
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