I'm pretty sure I've seen edger heads for use with combi-systems, so I'd imagine it's do-able, but if it was me, I'd want a run-guide wheel to keep staight as using it would be a bugger. Either gouging the edge of the concrete or chomping the grass to avoid it.
Personally I just use my back-pack brushcutter with a Lil'Juey 4 cord head on it, with 3mm cord. The flexable shaft lets me flip it around at any angle without twisting the engine around over my head.
Works well for me as I'm a lawnie using it in all sorts of terrain.
Still, it's worth a try!!
