Welcome to the forum.
I have never tried Silan honey. I once picked up a dark honey in Ruidoso NM. The Bee keeper said she was not sure what the bees got into, but it made some really good honey. It was very black in color and was to good to put into anything, so I found myself eating it.
I would hazard a guess that you could duplicate the honey in BeerSmith. The Potential should be about the same, you will need to adjust the SRM until it looks right I would say start at maybe 75 and adjust as needed (I'm just guessing because I have never seen Silan Honey). You might also look at the SRM of Belgian Candi Sugar to get an idea of where to start.
Hope this helps
Cheers
Preston