Not familiar with Inkscape, but if you can save it (export) as an .eps it MIGHT work in Signgo, it WILL if you can export as an .ai
SignGo>File>Import
It might read "convert to editable shape?"
if it does click "yes"
if it then reads "no output created must trace" the image is not supported
If it doesn't have the trace message you should be good to go.
Just hit the cut icon, then you can select by layer, color, etc.