I make my own hard candies on a regular basis, and I rarely find myself with enough time to cut, or even stretch the candy into a strand. I think this is something that requires a hot table.
The best I have managed to do is make markings using a bench scraper, and then I snapped the pieces off after cooling. Maybe consider using a ruler stick (a clean one). I warn you though, this can be risky. Over the years I have manage to get a few cuts and blisters working with this stuff. I have heard of cases where people have cut themselves bad enough to need stitching.
I use these molds sometimes. They work okay. They are very flexible. The hard part is pouring them to that perfect spot so they don't all attach as one piece at the tops. They don't seem like they can handle the 300 degree candy, but they've survived at least a dozen of my batches.
Good luck :)