I've done it in my 1/700 dreadnought with metal wire and WEM's star-shaped spreader, that seems just like what you would do. My method doesn't need any special tools so I'm afraid whether it will be helpful or not.

Place spreaders evenly on a graph paper with white glue and be noted that they should glue weakly because you will detach them after applying wires. This process determine the whole result, neat or crude, so you may pay much attention on it. I recommend to attach graph paper on any flat and stiff small thing such as small steel ruler as shown in my pic above to secure flat space and easy to handle it.

Carefully glue metal wire on each "arm" with super glue. Although metal wire strands are naturally straight but it needs extra care to be seen neat result.

Then detach it from graph paper and remove residual dried white glue at spreader if it exists. Attach other metal wire strands on residual "arms" which are originally attached on graph paper. Now you may get a bundle of cage antenna!

The result.... I also used some very short metal strand(in my memory, 2mm long each) to make merging part to attach normal single rigging part.
Please excuse my crude language skill, hope you can understand my words.
