Can anyone suggest a good universal headshell?

For what cartridge?

Viridian, wow, a wide variety of cartridges. The Audioquest-branded Orsonic is *excellent* and might be cheaper compared to the straight Orsonic. You could try the Audio-Technica 'Technihard' series, available from Audiocubes in a few different weights. Unfortunately not universal - you will probably want to match headshell weight to cartridge weight. On the other hand, they're not super-expensive.

With the Ikeda arm, I've found the Ikeda 1S/1R headshell excellent. It allows very little twisting though and many cartridges are too long to set overhang properly. juki has 'em. So does JAT.