FontCreator 11.5 does support Single-line Fonts
When that option is enabled, you can select single or double stroke fonts in the Export Settings dialogue.
Before trying kerning, try adjusting the side-bearings, e.g. for the c in your screenshot, reduce the right side-bearing by 7 funits, which will reduce the advance width to 358. This will, of course, affect the joining of c to all other glyphs.
See the tutorial on Joining Flowing Scripts.