Welcome TMPDM2etc.etc.etc.,

What you describe is a pretty common problem for folks shooting in tight spaces. Yeah, the jerry-rigged "ceiling cable" sounds a bit risky.

Have you considered a wall boom? It definitely has its limitations, but it might be enough for your needs.

To see one, go to: http://www.calumetphoto.com and type MF6230 in the search box...