I am guessing that someone has tried using wire or fishing line to hold a secondary mirror. What is the downside? There must be one, or else it would be done more often. I am sure you would need a relatively long holder so the wires attach away from each other.
Fort Lewis Observatory: (37.238, -108.052) ~2360m (7744 ft.) elevation.
Darkness - typically 6.5+
Scope - Meade 16" LX200; f6.3 focal reducer
Focus - JMI Smart focus
Camera - SBIG ST-10XE; (~.5"/pixel)
Guiding - AO-8 and/or Meade 5"/DSI/PHD